Date   

moderated Re: Categories for groups -- idea suggestion

Sharon Villines
 

One of the suggestions for developing a wiki is to allow people to enter information and create topics as they go. Then an organizer can come in and gently sort them out. I’ve tried this and it works very well. It’s easy to see in the list of topics exactly what you want.

One thing that happened is that some topics that would have been at the 3rd level in a logical subject category are at the top level because more members enter and seek information in that area.

Similar to the story of Indiana University’s new campus. They didn’t put in sidewalks for a year, and then put them on the paths where students walked. It may be an apochryphal story but the logic is the same.

I’ve spent a lot of time on Yahoo and other sites trying to find a place for cohousing and governance. Governance isn’t government, exactly. Government usually means city, state, or country level. Governance is a social science, under sociology that looks at the governing of any group or organization of people.

Cohousing is a cross between an intentional community and real estate development. Where to put these things.

One advantage of the Dewey system is that examples can be found so you know where to put something. It would be most helpful if someone is in charge of gently correcting self chosen categories so they maintain their usefulness. A bunch of unrelated stuff in a category quickly discourages searching at all.

• 000 – Computer science, information & general works
• 100 – Philosophy and psychology
• 200 – Religion
• 300 – Social sciences
• 400 – Language
• 500 – Pure Science
• 600 – Technology
• 700 – Arts & recreation
• 800 – Literature
• 900 – History & geography


List of the next 100 topics and the next thousands here:

https://www.oclc.org/en/dewey/features/summaries.html

Then one can refer to this to figure out where something goes. Only a few of these would end up being used but they would be more relevant.


moderated Re: Categories for groups -- idea suggestion

toki
 

On 04/03/2018 10:37 AM, Susanne wrote:

The goal of all search systems is to get an appropriate number of
results that are highly relevant to the search query, without missing any.
That is precisely why I advocate either Dewey Decimal or Library of
Congress Classification Headings. In both instances you're looking at
more than a century of determining where, and how to classify something.

English-language library cataloguers create catalogue records that
assign both a classification number (Dewey or Library of Congress) and
subject headings (usually LCSH) to each item in order to reduce the
Er no. The classification number is derived from the subject heading.
Taking a CPIP record, Subject Heading # 1 corresponds to the first 3
letters of the Dewey Decimal Number. Subject Heading # 2 correlates with
the first two (or three) numbers after the decimal. Then you either use
the third subject heading, or the cutter number, depending upon the
depth of the library holdings.

particular shelf in a library.  That is not what we are trying to do here.
But what is being discussed, is how to locate a specific group. An item
on a virtual shelf.

Al is right that without the need to locate a specific item on a library
shelf, assigning multiple categories is a valid approach.  And allows
for, e.g., discussion of Politics in a particular Region.
Both Dewey Decimal, and Library of Congress Classification allow for one
to get as specific as Green Politics in the Fourth Ward of New Orleans
between 1980 and 1985.

The controlled vocabulary used by either Dewey Decimal or Library of
Congress is incredibly simply to learn.

jonathon


moderated Re: Categories for groups -- idea suggestion

Walter Underwood
 

On Apr 3, 2018, at 8:08 AM, Al Ludwick / NN4ZZ <al@...> wrote:

Hi Chris, Victoria and Susanne,
Great feedback.  My first pass at categories was just that and I figured 20 entries was a good starting point.   I'll update my list with all of the feedback and post a new version with the goal of being broader in some cases and still keep it down to maybe 20-25 entries.  (it might not be until tomorrow…)

I’ve worked a lot with categories in search, over twenty years.

Twelve to twenty top-level categories is good. More than that doesn’t fit well on a page.

Each level can also have up to twenty sub-categories, though a dozen might be better.

More than three levels is hard to use.

Like Library of Congress Subject Headings, allow multiple subject tags for each cataloged item (group, in our case). For example, the North American Summits on the Air group would have labels for “amateur radio” and “mountaineering”. LCSH limits items to three labels.

Category labels can be grouped into facets. Each facet is about a different aspect. We’ve been talking about subject labels, but we could also use language (English, German) and maybe region (North America, Canada, …).

For example, a group about Radio Scouting in the US could be tagged with: subject:Scouting, subject:”amateur radio”, language:en, region:us.

Making a controlled vocabulary like this (also called a taxonomy or thesaurus) can be a LOT of work. For librarians, it is about six months of effort.

wunder
Walter Underwood
K6WRU
wunder@...
http://observer.wunderwood.org/  (my blog)

On Apr 3, 2018, at 8:08 AM, Al Ludwick / NN4ZZ <al@...> wrote:

Hi Chris, Victoria and Susanne,
Great feedback.  My first pass at categories was just that and I figured 20 entries was a good starting point.   I'll update my list with all of the feedback and post a new version with the goal of being broader in some cases and still keep it down to maybe 20-25 entries.  (it might not be until tomorrow...)

Chris, you are right about Amateur Radio as just one example of a hobby.    There seems to be a lot of "hobby" groups here so maybe there is another way to segregate them.   
  • Hobbies -  crafts, embroidery, stamps collecting, etc
  • Hobbies - technical, Amateur Radio, Electronics, etc 
It looks like there are about 5,000 groups here but not all are active, some are shells still, or only used for test.    If the "hobby" category includes a large percentage (e.g. 1,000 of them), having  discreet groups like "Amateur Radio" might still be warranted.  

Thoughts?

Regards,  Al / NN4ZZ  
al (at) nn4zz (dot) com


moderated Re: Categories for groups -- idea suggestion

Jujube <ellaxyu@...>
 

Great idea. Under Music, I'd suggest a category called "Instruments" and maybe Classical and Ethnic music.

----- Original Message -----
From: "Victoria" <dr.vcaesar@netcologne.de
To: main@beta.groups.io
Date sent: Tue, 3 Apr 2018 16:25:24 +0200
Subject: [beta] Categories for groups -- idea suggestion

Susanne,



We are talking about improving users' ability to search for and find groups that are relevant to their interests, right? And to do that by allowing group owners to characterize their groups to make them more findable in a search.

The goal of all search systems is to get an appropriate number of results that are highly relevant to the search query, without missing any.
---
that쨈s brought to the point perfectly!



And the categories fit for mostly everything. I allowed myself to add Medicine and put Pets under Family and Home:



쨌 Business & Finance �� Employment, Investments, Industries
쨌 Computers and Internet �� Cyber culture, Internet, User groups
쨌 Cultures and Community �� Issues, Cooking, Seniors,
쨌 Entertainment & Arts �� Movies, TV, Books
쨌 Family and Home �� Gardening, Genealogy, Parenting, Pets
쨌 Games �� Cards, Computer, Board
쨌 Government and Politics �� Law, Military, Parties [political, I assume]
쨌 Health & Wellness �� Beauty, Fitness, Support
쨌 Hobbies & Crafts �� Antiques, Collectibles, Models,
쨌 Music �� Rock & Pop, Rap, Country
쨌 Recreation & Sport �� Travel, Cars, Outdoors, Wrestling
쨌 Regional �� Countries, States/Provinces, Regions, Cities
쨌 Religion & Beliefs �� Christianity, Islam, Judaism, Paganism
쨌 Romance & Relationships �� Anniversaries, Heartbreak, Marriage
쨌 Schools & Education �� Classmates, High schools, Colleges
쨌 Science �� Astronomy, Biology, Medicine



Thanks

Victoria


moderated Re: Categories for groups -- idea suggestion

Al Ludwick / NN4ZZ
 

Hi Chris, Victoria and Susanne,
Great feedback.  My first pass at categories was just that and I figured 20 entries was a good starting point.   I'll update my list with all of the feedback and post a new version with the goal of being broader in some cases and still keep it down to maybe 20-25 entries.  (it might not be until tomorrow...)

Chris, you are right about Amateur Radio as just one example of a hobby.    There seems to be a lot of "hobby" groups here so maybe there is another way to segregate them.   
  • Hobbies -  crafts, embroidery, stamps collecting, etc
  • Hobbies - technical, Amateur Radio, Electronics, etc 
It looks like there are about 5,000 groups here but not all are active, some are shells still, or only used for test.    If the "hobby" category includes a large percentage (e.g. 1,000 of them), having  discreet groups like "Amateur Radio" might still be warranted.  

Thoughts?

Regards,  Al / NN4ZZ  
al (at) nn4zz (dot) com


moderated Re: Categories for groups -- idea suggestion

Chris Jones
 

On Mon, Apr 2, 2018 at 05:07 am, Al Ludwick / NN4ZZ wrote:
Anyway I took a quick pass at making a short list limited to 20 items, sorted alphabetically.
Adopting the role of Devil's Advocate for a minute... or several.

Firstly although it is not a topic that I would necessarily need to search for, where would Animal Health, Welfare,& Rescue fit into your table? I'm not sure that it would really be a good fit with Medical... .

Secondly, although I am a Radio Amateur myself I think you have been a bit naughty putting it in the list. It is, after all, a hobby and really has no more claim to being specifically listed by name than (say) Embroidery.

Thirdly, I am a member of 2 Groups with a specific interest in military communications, mainly from a historical perspective. I'm far from certain that Military...(etc) would necessarily be a good fit, mainly because of the "historical" connection. Would they fit Hobbies?  I'm not sure about that either. A sub - species of Amateur Radio? Well perhaps, but not a particularly good fit. Come to think of it, where would History fit into your list? (FWIW a further 2 similar groups are considering migrating to Groups.io)

While your list is much better than I expected, it seems to have large gaps (such as History) and it is not clear how that topic could be accommodated without it needing to be No 21 in the list.

I have absolutely no idea how many Groups.io hosts, much less how many more might turn up in the future. I am not trying to suggest that your notional limit of "20" should be increased by a large number, but I strongly suspect that any category that turns out to have a lot of completely disparate groups will need to have its own separate list, accessed from the main one.

Chris


moderated Categories for groups -- idea suggestion

 

Susanne,

 

We are talking about improving users' ability to search for and find groups that are relevant to their interests, right?  And to do that by allowing group owners to characterize their groups to make them more findable in a search.

The goal of all search systems is to get an appropriate number of results that are highly relevant to the search query, without missing any. 
---
that´s brought to the point perfectly!

 

And the categories fit for mostly everything. I allowed myself to add Medicine and put Pets under Family and Home:

 

·       Business & Finance – Employment, Investments, Industries
·       Computers and Internet – Cyber culture, Internet, User groups
·       Cultures and Community – Issues, Cooking, Seniors,
·       Entertainment & Arts – Movies, TV, Books
·       Family and Home – Gardening, Genealogy, Parenting, Pets
·       Games – Cards, Computer, Board
·       Government and Politics – Law, Military, Parties [political, I assume]
·       Health & Wellness – Beauty, Fitness, Support
·       Hobbies & Crafts – Antiques, Collectibles, Models,
·       Music – Rock & Pop, Rap, Country
·       Recreation & Sport – Travel, Cars, Outdoors, Wrestling
·       Regional  – Countries, States/Provinces, Regions, Cities
·       Religion & Beliefs – Christianity, Islam, Judaism, Paganism
·       Romance & Relationships – Anniversaries, Heartbreak, Marriage
·       Schools & Education – Classmates, High schools, Colleges
·       Science  – Astronomy, Biology, Medicine

 

Thanks

Victoria


moderated Re: Categories for groups -- idea suggestion

Susanne
 

We are talking about improving users' ability to search for and find groups that are relevant to their interests, right?  And to do that by allowing group owners to characterize their groups to make them more findable in a search.

The goal of all search systems is to get an appropriate number of results that are highly relevant to the search query, without missing any. 

I am not convinced that library classifications are useful in this instance.  Dewey is a means of classifying knowledge, not conversations.  It's top level categories are
  • 000 – Computer science, information & general works
  • 100 – Philosophy and psychology
  • 200 – Religion
  • 300 – Social sciences
  • 400 – Language
  • 500 – Pure Science
  • 600 – Technology
  • 700 – Arts & recreation
  • 800 – Literature
  • 900 – History & geography
Some might translate to groups discussion topics, but not all.

English-language library cataloguers create catalogue records that assign both a classification number (Dewey or Library of Congress) and subject headings (usually LCSH) to each item in order to reduce the field of search for useful materials about any given topic not necessarily to one specific place but to at least get it down to a handful of possible places out of a field of thousands of possibilities.  In both cases the schemes are controlled and have rules for assigning them.  The classification category is used as part of the construction of a call number that locates a particular item on a particular shelf in a library.  That is not what we are trying to do here. 

Yahoo's broad categories seem to me to reflect a reasonable, if not perfect, analysis of what people group together to talk about.  Its broad categories could be used for classifying groups while the subcategories (examples after each dash) could suggest potential tags.
·       Business & Finance – Employment, Investments, Industries
·       Computers and Internet – Cyber culture, Internet, User groups
·       Cultures and Community – Issues, Cooking, Seniors,
·       Entertainment & Arts – Movies, TV, Books
·       Family and Home – Gardening, Genealogy, Parenting
·       Games – Cards, Computer, Board
·       Government and Politics – Law, Military, Parties [political, I assume]
·       Health & Wellness – Beauty, Fitness, Support
·       Hobbies & Crafts – Antiques, Collectibles, Models,
·       Music – Rock & Pop, Rap, Country
·       Recreation & Sport – Travel, Cars, Outdoors, Wrestling
·       Regional  – Countries, States/Provinces, Regions, Cities
·       Religion & Beliefs – Christianity, Islam, Judaism, Paganism
·       Romance & Relationships – Anniversaries, Heartbreak, Marriage
·       Schools & Education – Classmates, High schools, Colleges
·       Science.  – Astronomy, Biology, Pets
( https://books.google.ca/books?id=r1_UsDnNHpMC&pg=PA90&lpg=PA90&dq=%22yahoo+groups%22+subcategories&source=bl&ots=kwPpDlGEXK&sig=zXZQGvigeJ1_LH6sBA2BlqlJ5PI&hl=en&sa=X&ved=0ahUKEwiI3oP8wZzaAhUqxlQKHWPhAfMQ6AEIQzAE#v=onepage&q=%22yahoo%20groups%22%20subcategories&f=false )

Al is right that without the need to locate a specific item on a library shelf, assigning multiple categories is a valid approach.  And allows for, e.g., discussion of Politics in a particular Region. 

Mark's preference for bottom up tagging by users removes the need to maintain a controlled vocabulary of tags but introduces the inherent disadvantages of inconsistency in choice of terms, spelling, punctuation, etc.  Unless the search engine can accommodate differences such as "colour" versus "color" or "railways" versus "railroads" or "weaving" versus "weavers" to the degree that Google does.

The assignment of one or more general categories will definitely narrow the field of search compared to the current undifferentiated list of groups.  That would make searchers happy.  And maybe needs to be implemented sooner rather than later given the growing number of groups. 

The combination of a few general categories with user-generated tags may improve the accuracy of searches still further.  But implementation is maybe not as urgent if it involves a lot of work. 

Shal, in your PTA example, how many of your tags appear as words in the description of your group?  How much more discoverability do the tags give you?

Susanne


At 2018-04-02 10:56 AM, Jim Fisher wrote:
If the Dewey system were used all Mark would need to do to implement it would
be to add a field to the public list of groups to hold the code, and then sort
on it, leaving group owners/moderators to fill in the field as appropriate. A
list  of codes could be on a publicly available database for reference. Two
digits would probably be plenty for this purpose.

Jim Fisher

On 1 Apr 2018 at 12:38, Jujube wrote:

> We could use the lists you mentioned.  I didn't know of them, so
> I thought we might have to make up one, though it's always good
> to find some inspiration.  My personal favourite is Yahoo Groups
> categorization because it's very specific, though we don't have
> to be nearly as fanciful.  The nice thing with Yahoo
> categorization is that there's various levels of categorization. 
> I'm not saying that we have to use Yahoo Groups categorization
> method.  Even a few caffdhories would help a lot.
>
> ----- Original Message -----
> From: "toki" <toki.kantoor@...
> To: main@beta.groups.io
> Date sent: Sun, 1 Apr 2018 17:38:03 +0000
> Subject: Re: [beta] Categories for groups -- idea suggestion
>
> On 04/01/2018 04:59 PM, Jujube wrote:
>
> We'll have to decide on a list, though.
>
> What is wrong with using either Dewey Decimal or LCC categories?
>
> jonathon
>


moderated Bug - Message not order by number

Benoît Dumeaux
 

After merge I have a date bug. Message are not order by number
https://groups.io/g/TheSeaofClaws/topic/5545134#4129


moderated Re: Categories for groups -- idea suggestion

Linda
 

Hi Toby,
The travel group (1A-Travelzine) is for both pleasure and business. Members plan their vacation trips as well as try to make the most of their personal time when they are away on business trips. It's all about getting the best advice from members who have been there, or live there.. I don't think it fits in Business & Finance.

People with CLL/SLL, seeking treatment advice or to share experiences or research about that or any other cancer or rare disease, would not be thinking in terms of Health, but Medical.

I think a combination of Al Ludwick's Categories and Tags would work well.

Linda

Linda - is the travel for pleasure or for business?  There could just as well be a travel group for business people in the Business & Finance category. A support group for a rare disease would fit well in Health with the name of the disease as one of the keywords.


moderated Re: Categories for groups -- idea suggestion

Walter Underwood
 

Dewey and LCC are systems for putting things in one place on a shelf.

For this, we need subject headings, not a classification/shelflisting system. 

LCSH is the subject heading system for Library of Congress.


Dewey Decimal Cataloging (DDC) is sometimes used with subject headings, but I’m blanking on the common ones right now. It might be the Sears List of Subject Headings.


There are lots more subject vocabularies, like MeSH (Medical Subject Headings) and the Legislative Subject Terms.


wunder
Walter Underwood
wunder@...
http://observer.wunderwood.org/  (my blog)

On Apr 2, 2018, at 7:30 PM, toki <toki.kantoor@...> wrote:

On 04/02/2018 12:07 PM, Al Ludwick / NN4ZZ wrote:

Anyway I took a quick pass at making a short list limited to 20 items, sorted alphabetically.

Library of Congress Classifications.

From https://en.wikipedia.org/wiki/Library_of_Congress_Classification

A General Works
B Philosophy, Psychology, and Religion
C Auxiliary Sciences of History
D General and Old World History
E History of America
F History of the United States and British, Dutch, French, and Latin
America
G Geography, Anthropology, and Recreation
H Social Sciences
J Political Science
K Law
L Education
M Music
N Fine Arts
P Language and Literature
Q Science
R Medicine
S Agriculture
T
Technology
U Military Science
V Naval Science
Z Bibliography, Library Science, and General Information Resources

Broader Categories:

Class A – General Works

   Subclass AC – Collections. Series. Collected works
   Subclass AE – Encyclopedias
   Subclass AG – Dictionaries and other general reference works
   Subclass AI – Indexes
   Subclass AM – Museums. Collectors and collecting
   Subclass AN – Newspapers
   Subclass AP – Periodicals
   Subclass AS – Academies and learned societies
   Subclass AY – Yearbooks. Almanacs. Directories
   Subclass AZ – History of scholarship and learning. The humanities

Class B – Philosophy, Psychology, Religion

   Subclass B – Philosophy (General)
   Subclass BC – Logic
   Subclass BD – Speculative philosophy
   Subclass BF – Psychology
   Subclass BH – Aesthetics
   Subclass BJ – Ethics
   Subclass BL – Religions. Mythology. Rationalism
   Subclass BM – Judaism
   Subclass BP – Islam. Bahaism. Theosophy, etc.
   Subclass BQ – Buddhism
   Subclass BR – Christianity
   Subclass BS – The Bible
   Subclass BT – Doctrinal theology
   Subclass BV – Practical Theology
   Subclass BX – Christian Denominations

Class C – Auxiliary Sciences of History (General)

   Subclass CB – History of Civilization
   Subclass CC – Archaeology
   Subclass CD – Diplomatics. Archives. Seals
   Subclass CE – Technical Chronology. Calendar
   Subclass CJ – Numismatics
   Subclass CN – Inscriptions. Epigraphy
   Subclass CR – Heraldry
   Subclass CS – Genealogy
   Subclass CT – Biography

Class D – World History (except American History)

   Subclass D – History (General)
   Subclass DA – Great Britain
   Subclass DAW – Central Europe
   Subclass DB – Austria – Liechtenstein – Hungary – Czechoslovakia
   Subclass DC – France – Andorra – Monaco
   Subclass DD – Germany
   Subclass DE – Greco-Roman World
   Subclass DF – Greece
   Subclass DG – Italy – Malta
   Subclass DH – Low Countries – Benelux Countries
   Subclass DJ – Netherlands (Holland)
   Subclass DJK – Eastern Europe (General)
   Subclass DK – Russia. Soviet Union. Former Soviet Republics – Poland
   Subclass DL – Northern Europe. Scandinavia
   Subclass DP – Spain – Portugal
   Subclass DQ – Switzerland
   Subclass DR – Balkan Peninsula
   Subclass DS – Asia
   Subclass DT – Africa
   Subclass DU – Oceania (South Seas)
   Subclass DX – History of the Romani people

Class E – American History

Class F – Local History of the United States and British, Dutch, French,
and Latin America

Class G – Geography, Anthropology, Recreation

   Subclass G – Geography (General). Atlases. Maps
   Subclass GA – Mathematical geography. Cartography
   Subclass GB – Physical geography
   Subclass GC – Oceanography
   Subclass GE – Environmental Sciences
   Subclass GF – Human ecology. Anthropogeography
   Subclass GN – Anthropology
   Subclass GR – Folklore
   Subclass GT – Manners and customs (General)
   Subclass GV – Recreation. Leisure

Class H – Social Sciences

   Subclass H – Social sciences (General)
   Subclass HA – Statistics
   Subclass HB – Economic theory. Demography
   Subclass HC – Economic history and conditions
   Subclass HD – Industries. Land use. Labor
   Subclass HE – Transportation and communications
   Subclass HF – Commerce
   Subclass HG – Finance
   Subclass HJ – Public finance
   Subclass HM – Sociology (General)
   Subclass HN – Social history and conditions. Social problems. Social
reform
   Subclass HQ – The family. Marriage, Women and Sexuality
   Subclass HS – Societies: secret, benevolent, etc.
   Subclass HT – Communities. Classes. Races
   Subclass HV – Social pathology. Social and public welfare. Criminology
   Subclass HX – Socialism. Communism. Anarchism

Class J – Political Science

   Subclass J – General legislative and executive papers
   Subclass JA – Political science (General)
   Subclass JC – Political theory
   Subclass JF – Political institutions and public administration
   Subclass JJ – Political institutions and public administration
(North America)
   Subclass JK – Political institutions and public administration
(United States)
   Subclass JL – Political institutions and public administration
(Canada, Latin America, etc.)
   Subclass JN – Political institutions and public administration (Europe)
   Subclass JQ – Political institutions and public administration
(Asia, Africa, Australia, Pacific Area, etc.)
   Subclass JS – Local government. Municipal government
   Subclass JV – Colonies and colonization. Emigration and immigration.
International migration
   Subclass JX – International law, see JZ and KZ (obsolete)
   Subclass JZ – International relations

Class K – Law

   Subclass K – Law in general. Comparative and uniform law. Jurisprudence
   Subclass KB – Religious law in general. Comparative religious law.
Jurisprudence
   Subclass KBM – Jewish law
   Subclass KBP – Islamic law
   Subclass KBR – History of canon law
   Subclass KBS – Canon law of Eastern churches
   Subclass KBT – Canon law of Eastern Rite Churches in Communion with
the Holy See of Rome
   Subclass KBU – Law of the Roman Catholic Church. The Holy See
   Subclasses – KD/KDK - United Kingdom and Ireland
   Subclass KDZ – America. North America
   Subclass KE – Canada
   Subclass KF – United States
   Subclass KG – Latin America – Mexico and Central America – West
Indies. Caribbean area
   Subclass KH – South America
   Subclasses KJ-KKZ – Europe
   Subclasses KL-KWX – Asia and Eurasia, Africa, Pacific Area, and
Antarctica
   Subclass KU/KUQ – Law of Australia and New Zealand
   Subclass KZ – Law of nations

Class L – Education

   Subclass L – Education (General)
   Subclass LA – History of education
   Subclass LB – Theory and practice of education
   Subclass LC – Special aspects of education
   Subclass LD – Individual institutions – United States
   Subclass LE – Individual institutions – America (except United States)
   Subclass LF – Individual institutions – Europe
   Subclass LG – Individual institutions – Asia, Africa, Indian Ocean
islands, Australia, New Zealand, Pacific islands
   Subclass LH – College and school magazines and papers
   Subclass LJ – Student fraternities and societies, United States
   Subclass LT – Textbooks

Class M – Music

   Subclass M – Music
   Subclass ML – Literature on music
   Subclass MT – Instruction and study

Class N – Fine Arts

   Subclass N – Visual arts
   Subclass NA – Architecture
   Subclass NB – Sculpture
   Subclass NC – Drawing. Design. Illustration
   Subclass ND – Painting
   Subclass NE – Print media
   Subclass NK – Decorative arts
   Subclass NX – Arts in general

Class P – Language and Literature

   Subclass P – Philology. Linguistics
   Subclass PA – Greek language and literature. Latin language and
literature
   Subclass PB – Modern languages. Celtic languages and literature
   Subclass PC – Romanic languages
   Subclass PD – Germanic languages. Scandinavian languages
   Subclass PE – English language
   Subclass PF – West Germanic languages
   Subclass PG – Slavic languages and literatures. Baltic languages.
Albanian language
   Subclass PH – Uralic languages. Basque language
   Subclass PJ – Oriental languages and literatures
   Subclass PK – Indo-Iranian languages and literatures
   Subclass PL – Languages and literatures of Eastern Asia, Africa, Oceania
   Subclass PM – Hyperborean, Native American, and artificial languages
   Subclass PN – Literature (General)
   Subclass PQ – French literature – Italian literature – Spanish
literature – Portuguese literature
   Subclass PR – English literature
   Subclass PS – American literature
   Subclass PT – German literature – Dutch literature – Flemish
literature since 1830 – Afrikaans literature -Scandinavian literature –
Old Norse literature: Old Icelandic and Old Norwegian – Modern Icelandic
literature – Faroese literature – Danish literature – Norwegian
literature – Swedish literature
   Subclass PZ – Fiction and juvenile belles lettres

Class Q – Science

   Subclass Q – Science (General)
   Subclass QA – Mathematics
   Subclass QB – Astronomy
   Subclass QC – Physics
   Subclass QD – Chemistry
   Subclass QE – Geology
   Subclass QH – Natural history – Biology
   Subclass QK – Botany
   Subclass QL – Zoology
   Subclass QM – Human anatomy
   Subclass QP – Physiology
   Subclass QR – Microbiology

Class R – Medicine

   Subclass R – Medicine (General)
   Subclass RA – Public aspects of medicine
   Subclass RB – Pathology
   Subclass RC – Internal medicine
   Subclass RD – Surgery
   Subclass RE – Ophthalmology
   Subclass RF – Otorhinolaryngology
   Subclass RG – Gynecology and Obstetrics
   Subclass RJ – Pediatrics
   Subclass RK – Dentistry
   Subclass RL – Dermatology
   Subclass RM – Therapeutics. Pharmacology
   Subclass RS – Pharmacy and materia medica
   Subclass RT – Nursing
   Subclass RV – Botanic, Thomsonian, and Eclectic medicine
   Subclass RX – Homeopathy
   Subclass RZ – Other systems of medicine

Class S – Agriculture

   Subclass S – Agriculture (General)
   Subclass SB – Horticulture. Plant propagation. Plant breeding
   Subclass SD – Forestry. Arboriculture. Silviculture
   Subclass SF – Animal husbandry. Animal science
   Subclass SH – Aquaculture. Fisheries. Angling
   Subclass SK – Hunting

Class T – Technology

   Subclass T – Technology (General)
   Subclass TA – Engineering Civil engineering (General).
   Subclass TC – Hydraulic engineering. Ocean engineering
   Subclass TD – Environmental technology. Sanitary engineering
   Subclass TE – Highway engineering. Roads and pavements
   Subclass TF – Railroad engineering and operation
   Subclass TG – Bridges
   Subclass TH – Building construction
   Subclass TJ – Mechanical engineering and machinery
   Subclass TK – Electrical engineering. Electronics. Nuclear engineering
   Subclass TL – Motor vehicles. Aeronautics. Astronautics
   Subclass TN – Mining engineering. Metallurgy
   Subclass TP – Chemical technology
   Subclass TR – Photography
   Subclass TS – Manufacturing engineering. Mass production
   Subclass TT – Handicrafts. Arts and crafts
   Subclass TX – Home economics

Class U – Military Science

   Subclass U – Military science (General)
   Subclass UA – Armies: Organization, distribution, military situation
   Subclass UB – Military administration
   Subclass UC – Military maintenance and transportation
   Subclass UD – Infantry
   Subclass UE – Cavalry. Armor
   Subclass UF – Artillery
   Subclass UG – Military engineering. Air forces
   Subclass UH – Other military services

Class V – Naval Science

   Subclass V – Naval science (General)
   Subclass VA – Navies: Organization, distribution, naval situation
   Subclass VB – Naval administration
   Subclass VC – Naval maintenance
   Subclass VD – Naval seamen
   Subclass VE – Marines
   Subclass VF – Naval ordnance
   Subclass VG – Minor services of navies
   Subclass VK – Navigation. Merchant marine
   Subclass VM – Naval architecture. Shipbuilding. Marine engineering

Class Z – Bibliography, Library Science

   Subclass Z – Books (General). Writing. Paleography. Book industries
and trade. Libraries. Bibliography
   Subclass ZA – Information resources/materials

jonathon





moderated Re: Categories for groups -- idea suggestion

toki
 

On 04/02/2018 12:07 PM, Al Ludwick / NN4ZZ wrote:

Anyway I took a quick pass at making a short list limited to 20 items, sorted alphabetically.
Library of Congress Classifications.

From https://en.wikipedia.org/wiki/Library_of_Congress_Classification

A General Works
B Philosophy, Psychology, and Religion
C Auxiliary Sciences of History
D General and Old World History
E History of America
F History of the United States and British, Dutch, French, and Latin
America
G Geography, Anthropology, and Recreation
H Social Sciences
J Political Science
K Law
L Education
M Music
N Fine Arts
P Language and Literature
Q Science
R Medicine
S Agriculture
T
Technology
U Military Science
V Naval Science
Z Bibliography, Library Science, and General Information Resources

Broader Categories:

Class A – General Works

Subclass AC – Collections. Series. Collected works
Subclass AE – Encyclopedias
Subclass AG – Dictionaries and other general reference works
Subclass AI – Indexes
Subclass AM – Museums. Collectors and collecting
Subclass AN – Newspapers
Subclass AP – Periodicals
Subclass AS – Academies and learned societies
Subclass AY – Yearbooks. Almanacs. Directories
Subclass AZ – History of scholarship and learning. The humanities

Class B – Philosophy, Psychology, Religion

Subclass B – Philosophy (General)
Subclass BC – Logic
Subclass BD – Speculative philosophy
Subclass BF – Psychology
Subclass BH – Aesthetics
Subclass BJ – Ethics
Subclass BL – Religions. Mythology. Rationalism
Subclass BM – Judaism
Subclass BP – Islam. Bahaism. Theosophy, etc.
Subclass BQ – Buddhism
Subclass BR – Christianity
Subclass BS – The Bible
Subclass BT – Doctrinal theology
Subclass BV – Practical Theology
Subclass BX – Christian Denominations

Class C – Auxiliary Sciences of History (General)

Subclass CB – History of Civilization
Subclass CC – Archaeology
Subclass CD – Diplomatics. Archives. Seals
Subclass CE – Technical Chronology. Calendar
Subclass CJ – Numismatics
Subclass CN – Inscriptions. Epigraphy
Subclass CR – Heraldry
Subclass CS – Genealogy
Subclass CT – Biography

Class D – World History (except American History)

Subclass D – History (General)
Subclass DA – Great Britain
Subclass DAW – Central Europe
Subclass DB – Austria – Liechtenstein – Hungary – Czechoslovakia
Subclass DC – France – Andorra – Monaco
Subclass DD – Germany
Subclass DE – Greco-Roman World
Subclass DF – Greece
Subclass DG – Italy – Malta
Subclass DH – Low Countries – Benelux Countries
Subclass DJ – Netherlands (Holland)
Subclass DJK – Eastern Europe (General)
Subclass DK – Russia. Soviet Union. Former Soviet Republics – Poland
Subclass DL – Northern Europe. Scandinavia
Subclass DP – Spain – Portugal
Subclass DQ – Switzerland
Subclass DR – Balkan Peninsula
Subclass DS – Asia
Subclass DT – Africa
Subclass DU – Oceania (South Seas)
Subclass DX – History of the Romani people

Class E – American History

Class F – Local History of the United States and British, Dutch, French,
and Latin America

Class G – Geography, Anthropology, Recreation

Subclass G – Geography (General). Atlases. Maps
Subclass GA – Mathematical geography. Cartography
Subclass GB – Physical geography
Subclass GC – Oceanography
Subclass GE – Environmental Sciences
Subclass GF – Human ecology. Anthropogeography
Subclass GN – Anthropology
Subclass GR – Folklore
Subclass GT – Manners and customs (General)
Subclass GV – Recreation. Leisure

Class H – Social Sciences

Subclass H – Social sciences (General)
Subclass HA – Statistics
Subclass HB – Economic theory. Demography
Subclass HC – Economic history and conditions
Subclass HD – Industries. Land use. Labor
Subclass HE – Transportation and communications
Subclass HF – Commerce
Subclass HG – Finance
Subclass HJ – Public finance
Subclass HM – Sociology (General)
Subclass HN – Social history and conditions. Social problems. Social
reform
Subclass HQ – The family. Marriage, Women and Sexuality
Subclass HS – Societies: secret, benevolent, etc.
Subclass HT – Communities. Classes. Races
Subclass HV – Social pathology. Social and public welfare. Criminology
Subclass HX – Socialism. Communism. Anarchism

Class J – Political Science

Subclass J – General legislative and executive papers
Subclass JA – Political science (General)
Subclass JC – Political theory
Subclass JF – Political institutions and public administration
Subclass JJ – Political institutions and public administration
(North America)
Subclass JK – Political institutions and public administration
(United States)
Subclass JL – Political institutions and public administration
(Canada, Latin America, etc.)
Subclass JN – Political institutions and public administration (Europe)
Subclass JQ – Political institutions and public administration
(Asia, Africa, Australia, Pacific Area, etc.)
Subclass JS – Local government. Municipal government
Subclass JV – Colonies and colonization. Emigration and immigration.
International migration
Subclass JX – International law, see JZ and KZ (obsolete)
Subclass JZ – International relations

Class K – Law

Subclass K – Law in general. Comparative and uniform law. Jurisprudence
Subclass KB – Religious law in general. Comparative religious law.
Jurisprudence
Subclass KBM – Jewish law
Subclass KBP – Islamic law
Subclass KBR – History of canon law
Subclass KBS – Canon law of Eastern churches
Subclass KBT – Canon law of Eastern Rite Churches in Communion with
the Holy See of Rome
Subclass KBU – Law of the Roman Catholic Church. The Holy See
Subclasses – KD/KDK - United Kingdom and Ireland
Subclass KDZ – America. North America
Subclass KE – Canada
Subclass KF – United States
Subclass KG – Latin America – Mexico and Central America – West
Indies. Caribbean area
Subclass KH – South America
Subclasses KJ-KKZ – Europe
Subclasses KL-KWX – Asia and Eurasia, Africa, Pacific Area, and
Antarctica
Subclass KU/KUQ – Law of Australia and New Zealand
Subclass KZ – Law of nations

Class L – Education

Subclass L – Education (General)
Subclass LA – History of education
Subclass LB – Theory and practice of education
Subclass LC – Special aspects of education
Subclass LD – Individual institutions – United States
Subclass LE – Individual institutions – America (except United States)
Subclass LF – Individual institutions – Europe
Subclass LG – Individual institutions – Asia, Africa, Indian Ocean
islands, Australia, New Zealand, Pacific islands
Subclass LH – College and school magazines and papers
Subclass LJ – Student fraternities and societies, United States
Subclass LT – Textbooks

Class M – Music

Subclass M – Music
Subclass ML – Literature on music
Subclass MT – Instruction and study

Class N – Fine Arts

Subclass N – Visual arts
Subclass NA – Architecture
Subclass NB – Sculpture
Subclass NC – Drawing. Design. Illustration
Subclass ND – Painting
Subclass NE – Print media
Subclass NK – Decorative arts
Subclass NX – Arts in general

Class P – Language and Literature

Subclass P – Philology. Linguistics
Subclass PA – Greek language and literature. Latin language and
literature
Subclass PB – Modern languages. Celtic languages and literature
Subclass PC – Romanic languages
Subclass PD – Germanic languages. Scandinavian languages
Subclass PE – English language
Subclass PF – West Germanic languages
Subclass PG – Slavic languages and literatures. Baltic languages.
Albanian language
Subclass PH – Uralic languages. Basque language
Subclass PJ – Oriental languages and literatures
Subclass PK – Indo-Iranian languages and literatures
Subclass PL – Languages and literatures of Eastern Asia, Africa, Oceania
Subclass PM – Hyperborean, Native American, and artificial languages
Subclass PN – Literature (General)
Subclass PQ – French literature – Italian literature – Spanish
literature – Portuguese literature
Subclass PR – English literature
Subclass PS – American literature
Subclass PT – German literature – Dutch literature – Flemish
literature since 1830 – Afrikaans literature -Scandinavian literature –
Old Norse literature: Old Icelandic and Old Norwegian – Modern Icelandic
literature – Faroese literature – Danish literature – Norwegian
literature – Swedish literature
Subclass PZ – Fiction and juvenile belles lettres

Class Q – Science

Subclass Q – Science (General)
Subclass QA – Mathematics
Subclass QB – Astronomy
Subclass QC – Physics
Subclass QD – Chemistry
Subclass QE – Geology
Subclass QH – Natural history – Biology
Subclass QK – Botany
Subclass QL – Zoology
Subclass QM – Human anatomy
Subclass QP – Physiology
Subclass QR – Microbiology

Class R – Medicine

Subclass R – Medicine (General)
Subclass RA – Public aspects of medicine
Subclass RB – Pathology
Subclass RC – Internal medicine
Subclass RD – Surgery
Subclass RE – Ophthalmology
Subclass RF – Otorhinolaryngology
Subclass RG – Gynecology and Obstetrics
Subclass RJ – Pediatrics
Subclass RK – Dentistry
Subclass RL – Dermatology
Subclass RM – Therapeutics. Pharmacology
Subclass RS – Pharmacy and materia medica
Subclass RT – Nursing
Subclass RV – Botanic, Thomsonian, and Eclectic medicine
Subclass RX – Homeopathy
Subclass RZ – Other systems of medicine

Class S – Agriculture

Subclass S – Agriculture (General)
Subclass SB – Horticulture. Plant propagation. Plant breeding
Subclass SD – Forestry. Arboriculture. Silviculture
Subclass SF – Animal husbandry. Animal science
Subclass SH – Aquaculture. Fisheries. Angling
Subclass SK – Hunting

Class T – Technology

Subclass T – Technology (General)
Subclass TA – Engineering Civil engineering (General).
Subclass TC – Hydraulic engineering. Ocean engineering
Subclass TD – Environmental technology. Sanitary engineering
Subclass TE – Highway engineering. Roads and pavements
Subclass TF – Railroad engineering and operation
Subclass TG – Bridges
Subclass TH – Building construction
Subclass TJ – Mechanical engineering and machinery
Subclass TK – Electrical engineering. Electronics. Nuclear engineering
Subclass TL – Motor vehicles. Aeronautics. Astronautics
Subclass TN – Mining engineering. Metallurgy
Subclass TP – Chemical technology
Subclass TR – Photography
Subclass TS – Manufacturing engineering. Mass production
Subclass TT – Handicrafts. Arts and crafts
Subclass TX – Home economics

Class U – Military Science

Subclass U – Military science (General)
Subclass UA – Armies: Organization, distribution, military situation
Subclass UB – Military administration
Subclass UC – Military maintenance and transportation
Subclass UD – Infantry
Subclass UE – Cavalry. Armor
Subclass UF – Artillery
Subclass UG – Military engineering. Air forces
Subclass UH – Other military services

Class V – Naval Science

Subclass V – Naval science (General)
Subclass VA – Navies: Organization, distribution, naval situation
Subclass VB – Naval administration
Subclass VC – Naval maintenance
Subclass VD – Naval seamen
Subclass VE – Marines
Subclass VF – Naval ordnance
Subclass VG – Minor services of navies
Subclass VK – Navigation. Merchant marine
Subclass VM – Naval architecture. Shipbuilding. Marine engineering

Class Z – Bibliography, Library Science

Subclass Z – Books (General). Writing. Paleography. Book industries
and trade. Libraries. Bibliography
Subclass ZA – Information resources/materials

jonathon


moderated Re: Categories for groups -- idea suggestion

toki
 

On 04/02/2018 12:07 PM, Al Ludwick wrote:

Anyway I took a quick pass at making a short list limited to 20 items, sorted alphabetically.
From https://en.wikipedia.org/wiki/List_of_Dewey_Decimal_classes

Dewey Decimal Top Level Categories:
000 – Computer science, information & general works
100 – Philosophy and psychology
200 – Religion
300 – Social sciences
400 – Language
500 – Pure Science
600 – Technology
700 – Arts & recreation
800 – Literature
900 – History & geography

Broader categories:

Class 000 – Computer science, information & general works

000 Computer science, knowledge & systems
000 Computer science, information & general works
001 Knowledge
002 The book (writing, libraries, and book-related topics)
003 Systems
004 Data processing & computer science
005 Computer programming, programs & data
006 Special computer methods
007–009 [Unassigned]
010 Bibliographies
010 Bibliography
011 Bibliographies
012 Bibliographies of individuals
013 [Unassigned]
014 Bibliographies of anonymous & pseudonymous works
015 Bibliographies of works from specific places
016 Bibliographies of works on specific subjects
017 General subject catalogs
018 Catalogs arranged by author, date, etc.
019 Dictionary catalogs
020 Library & information sciences
020 Library & information sciences
021 Library relationships (with archives, information centers, etc.)
022 Administration of physical plant
023 Personnel management
024 [Unassigned]
025 Library operations
026 Libraries for specific subjects
027 General libraries
028 Reading & use of other information media
029 [Unassigned]
030 Encyclopedias & books of facts
030 General encyclopedic works
031 Encyclopedias in American English
032 Encyclopedias in English
033 Encyclopedias in other Germanic languages
034 Encyclopedias in French, Occitan, and Catalan
035 Encyclopedias in Italian, Romanian, and related languages
036 Encyclopedias in Spanish & Portuguese
037 Encyclopedias in Slavic languages
038 Encyclopedias in Scandinavian languages
039 Encyclopedias in other languages
040 Unassigned (formerly Biographies)
050 Magazines, journals & serials
050 General serial publications
051 Serials in American English
052 Serials in English
053 Serials in other Germanic languages
054 Serials in French, Occitan, and Catalan
055 Serials in Italian, Romanian, and related languages
056 Serials in Spanish & Portuguese
057 Serials in Slavic languages
058 Serials in Scandinavian languages
059 Serials in other languages
060 Associations, organizations & museums
060 General organizations & museum science
061 Organizations in North America
062 Organizations in British Isles; in England
063 Organizations in central Europe; in Germany
064 Organizations in France & Monaco
065 Organizations in Italy & adjacent islands
066 Organizations in Iberian peninsula & adjacent islands
067 Organizations in eastern Europe; in Russia
068 Organizations in other geographic areas
069 Museum science
070 News media, journalism & publishing
070 News media, journalism, and publishing
071 Newspapers in North America
072 Newspapers in British Isles; in England
073 Newspapers in central Europe; in Germany
074 Newspapers in France & Monaco
075 Newspapers in Italy & adjacent islands
076 Newspapers in Iberian peninsula & adjacent islands
077 Newspapers in eastern Europe; in Russia
078 Newspapers in Scandinavia
079 Newspapers in other geographic areas
080 Quotations
080 General collections
081 Collections in American English
082 Collections in English
083 Collections in other Germanic languages
084 Collections in French, Occitan, Catalan
085 Collections in Italian, Romanian, & related languages
086 Collections in Spanish & Portuguese
087 Collections in Slavic languages
088 Collections in Scandinavian languages
089 Collections in other languages
090 Manuscripts & rare books
090 Manuscripts and rare books
091 Manuscripts
092 Block books
093 Incunabula
094 Printed books
095 Books notable for bindings
096 Books notable for illustrations
097 Books notable for ownership or origin
098 Prohibited works, forgeries, and hoaxes
099 Books notable for format

Class 100 – Philosophy & psychology

100 Philosophy
100 Philosophy & psychology
101 Theory of philosophy
102 Miscellany
103 Dictionaries & encyclopedias
104 [Unassigned]
105 Serial publications
106 Organizations & management
107 Education, research, related topics of philosophy
108 Groups of people
109 History & collected biography
110 Metaphysics
110 Metaphysics
111 Ontology
112 No longer used—formerly Methodology
113 Cosmology (Philosophy of nature)
114 Space
115 Time
116 Change
117 Structure
118 Force and energy
119 Number and quantity
120 Epistemology
120 Epistemology, causation, and humankind
121 Epistemology (Theory of knowledge)
122 Causation
123 Determinism and indeterminism
124 Teleology
125 No longer used—formerly Infinity
126 The self
127 The unconscious & the subconscious
128 Humankind
129 Origin & destiny of individual souls
130 Parapsychology & occultism
130 Parapsychology & occultism
131 Parapsychological and occult methods for achieving
well-being, happiness, success
132 No longer used—formerly Mental derangements
133 Specific topics in parapsychology & occultism
134 No longer used—formerly Mesmerism & Clairvoyance
135 Dreams & mysteries
136 No longer used—formerly Mental characteristics
137 Divinatory graphology
138 Physiognomy
139 Phrenology
140 Philosophical schools of thought
140 Specific philosophical schools and viewpoints
141 Idealism & related systems & doctrines
142 Critical philosophy
143 Bergsonism & intuitionism
144 Humanism & related systems & doctrines
145 Sensationalism
146 Naturalism & related systems & doctrines
147 Pantheism & related systems & doctrines
148 Dogmatism, eclecticism, liberalism, syncretism, & traditionalism
149 Other philosophical systems & doctrines
150 Psychology
150 Psychology
151 No longer used—formerly Intellect
152 Sensory perception, movement, emotions, & physiological drives
153 Conscious mental processes & intelligence
154 Subconscious & altered states & processes
155 Differential & developmental psychology
156 Comparative psychology
157 No longer used—formerly Emotions
158 Applied psychology
159 No longer used—formerly Will
160 Philosophical logic
160 Philosophical logic
161 Induction
162 Deduction
163–164 Not assigned or no longer used
165 Fallacies & sources of error
166 Syllogisms
167 Hypotheses
168 Argument & persuasion
169 Analogy
170 Ethics
170 Ethics (Moral philosophy)
171 Ethical systems
172 Political ethics
173 Ethics of family relationships
174 Occupational ethics
175 Ethics of recreation, leisure, public performances,
communication
176 Ethics of sex & reproduction
177 Ethics of social relations
178 Ethics of consumption
179 Other ethical norms
180 Ancient, medieval, & Eastern philosophy
180 Ancient, medieval, eastern philosophy
181 Eastern philosophy
182 Pre-Socratic Greek philosophies
183 Sophistic, Socratic, related Greek philosophies
184 Platonic philosophy
185 Aristotelian philosophy
186 Skeptic & Neoplatonic philosophies
187 Epicurean philosophy
188 Stoic philosophy
189 Medieval Western philosophy
190 Modern Western philosophy (19th-century, 20th-century)
190 Modern Western & other noneastern philosophy
191 Philosophy of the United States and Canada
192 Philosophy of the British Isles
193 Philosophy of Germany and Austria
194 Philosophy of France
195 Philosophy of Italy
196 Philosophy of Spain and Portugal
197 Philosophy of Russia
198 Philosophy of Scandinavia & Finland
199 Philosophy in other geographic areas

Class 200 – Religion

200 Religion
200 Religion
201 Religious mythology, general classes of religion,
interreligious relations and attitudes, social theology
202 Doctrines
203 Public worship and other practices
204 Religious experience, life, practice
205 Religious ethics
206 Leaders and organization
207 Missions and religious education
208 Sources
209 Sects and reform movements
210 Philosophy & theory of religion
210 Philosophy & theory of religion
211 Concepts of God
212 Existence, ways of knowing God, attributes of God
213 Creation
214 Theodicy
215 Science & religion
216 No longer used—formerly Evil
217 No longer used—formerly Prayer
218 Humankind
219 No longer used—formerly Analogies
220 The Bible
220 Bible
221 Old Testament (Tanakh)
222 Historical books of Old Testament
223 Poetic books of Old Testament
224 Prophetic books of Old Testament
225 New Testament
226 Gospels & Acts
227 Epistles
228 Revelation (Apocalypse)
229 Apocrypha, pseudepigrapha, & intertestamental works
230 Christianity
230 Christianity
231 God
232 Jesus Christ & his family
233 Humankind
234 Salvation & grace
235 Spiritual beings
236 Eschatology
237 No longer used—formerly Future state
238 Creeds, confessions of faith, covenants, & catechisms
239 Apologetics & polemics
240 Christian practice & observance
240 Christian moral and devotional theology
241 Christian ethics
242 Devotional literature
243 Evangelistic writings for individuals and families
244 No longer used—formerly Religious fiction
245 No longer used—formerly Hymnology
246 Use of art in Christianity
247 Church furnishings & related articles
248 Christian experience, practice, life
249 Christian observances in family life
250 Christian orders & local church
250 Local Christian church and Christian religious orders
251 Preaching (Homiletics)
252 Texts of sermons
253 Pastoral office and work (Pastoral theology)
254 Parish administration
255 Religious congregations & orders
256 No longer used—formerly Religious societies
257 No longer used—formerly Parochial schools, libraries, etc.
258 No longer used—formerly Parochial medicine
259 Pastoral care of families, of specific groups of people
260 Social & ecclesiastical theology
260 Christian social and ecclesiastical theology
261 Social theology and interreligious relations and attitudes
262 Ecclesiology
263 Days, times, places of religious observance
264 Public worship
265 Sacraments, other rites & acts
266 Missions
267 Associations for religious work
268 Religious education
269 Spiritual renewal
270 History of Christianity
270 History, geographic treatment, biography of Christianity
271 Religious congregations and orders in church history
272 Persecutions in church history
273 Doctrinal controversies and heresies in general church history
274 Christianity in Europe
275 Christianity in Asia
276 Christianity in Africa
277 Christianity in North America
278 Christianity in South America
279 History of Christianity in other areas
280 Christian denominations
280 Denominations and sects of Christian church
281 Early church & Eastern churches
282 Roman Catholic Church
283 Anglican churches
284 Protestant denominations of Continental origin & related body
285 Presbyterian churches, Reformed churches centered in
America, Congregational churches
286 Baptist, Restoration Movement, Adventist churches
287 Methodist churches; churches related to Methodism
288 No longer used—formerly Unitarian
289 Other denominations & sects
290 Other religions
290 Other religions
291 No longer used—formerly Comparative religion
292 Classical religion (Greek & Roman religion)
293 Germanic religion
294 Religions of Indic origin
295 Zoroastrianism (Mazdaism, Parseeism)
296 Judaism
297 Islam, Bábism & Bahá'í Faith
298 No longer used—formerly Mormonism
299 Religions not provided for elsewhere

Class 300 – Social sciences

300 Social sciences, sociology & anthropology
300 Social sciences
301 Sociology & anthropology
302 Social interaction
303 Social processes
304 Factors affecting social behavior
305 Groups of people
306 Culture & institutions
307 Communities
308 No longer used—formerly Polygraphy
309 No longer used—formerly History of sociology
310 Statistics
310 Collections of general statistics
311 No longer used—formerly Theory and methods
312 No longer used—formerly Population
313 No longer used—formerly Special topics
314 General statistics of Europe
315 General statistics of Asia
316 General statistics of Africa
317 General statistics of North America
318 General statistics of South America
319 General statistics of Australasia, Pacific Ocean islands,
Atlantic Ocean islands, Arctic islands, Antarctica
320 Political science
320 Political science (Politics & government)
321 Systems of governments & states
322 Relation of state to organized groups & their members
323 Civil & political rights
324 The political process
325 International migration & colonization
326 Slavery & emancipation
327 International relations
328 The legislative process
329 Not assigned or no longer used
330 Economics
330 Economics
331 Labor economics
332 Financial economics
333 Economics of land & energy
334 Cooperatives
335 Socialism & related systems
336 Public finance
337 International economics
338 Production
339 Macroeconomics & related topics
340 Law
340 Law
341 Law of nations
342 Constitutional & administrative law
343 Military, defense, public property, public finance, tax,
commerce (trade), industrial law
344 Labor, social service, education, cultural law
345 Criminal law
346 Private law
347 Procedure & courts
348 Laws, regulations, cases
349 Law of specific jurisdictions, areas, socioeconomic regions,
regional intergovernmental organizations
350 Public administration & military science
350 Public administration & military science
351 Public administration
352 General considerations of public administration
353 Specific fields of public administration
354 Public administration of economy & environment
355 Military science
356 Foot forces & warfare
357 Mounted forces & warfare
358 Air & other specialized forces & warfare; engineering &
related services
359 Sea forces & warfare
360 Social problems & social services
360 Social problems & services; associations
361 Social problems & services
362 Social problems of & services to groups of people
363 Other social problems & services
364 Criminology
365 Penal & related institutions
366 Secret associations & societies
367 General clubs
368 Insurance
369 Associations
370 Education
370 Education
371 Schools & their activities; special education
372 Primary education (elementary education)
373 Secondary education
374 Adult education
375 Curricula
376 No longer used—formerly Education of women
377 No longer used—formerly Ethical education
378 Higher education (Tertiary education)
379 Public policy issues in education
380 Commerce, communications, & transportation
380 Commerce, communications, transportation
381 Commerce (Trade)
382 International commerce (Foreign trade)
383 Postal communication
384 Communications
385 Railroad transportation
386 Inland waterway & ferry transportation
387 Water, air, space transportation
388 Transportation
389 Metrology & standardization
390 Customs, etiquette, & folklore
390 Customs, etiquette, folklore
391 Costume & personal appearance
392 Customs of life cycle & domestic life
393 Death customs
394 General customs
395 Etiquette (Manners)
396 No longer used—formerly Women's position and treatment
397 No longer used—formerly outcast studies
398 Folklore
399 Customs of war & diplomacy

Class 400 – Language

400 Language
400 Language
401 Philosophy & theory; international languages
402 Miscellany
403 Dictionaries, encyclopedias, concordances
404 Special topics of language
405 Serial publications
406 Organizations & management
407 Education, research, related topics
408 Groups of people
409 Geographic treatment & biography
410 Linguistics
410 Linguistics
411 Writing systems of standard forms of languages
412 Etymology of standard forms of languages
413 Dictionaries of standard forms of languages
414 Phonology & phonetics of standard forms of languages
415 Grammar of standard forms of languages
416 No longer used—formerly Prosody
417 Dialectology & historical linguistics
418 Standard usage (Prescriptive linguistics)
419 Sign languages
420 English & Old English languages
420 English & Old English (Anglo-Saxon)
421 Writing system, phonology, phonetics of standard English
422 Etymology of standard English
423 Dictionaries of standard English
424 No longer used—formerly English thesauruses
425 Grammar of standard English
426 No longer used—formerly English prosodies
427 Historical & geographical variations, modern nongeographic
variations of English
428 Standard English usage (Prescriptive linguistics)
429 Old English (Anglo-Saxon)
430 German & related languages
430 German and related languages
431 Writing systems, phonology, phonetics of standard German
432 Etymology of standard German
433 Dictionaries of standard German
434 Not assigned or no longer used
435 Grammar of standard German
436 Not assigned or no longer used
437 Historical & geographic variations, modern nongeographic
variations of German
438 Standard German usage (Prescriptive linguistics)
439 Other Germanic languages
440 French & related languages
440 French & related Romance languages
441 Writing systems, phonology, phonetics of standard French
442 Etymology of standard French
443 Dictionaries of standard French
444 Not assigned or no longer used
445 Grammar of standard French
446 Not assigned or no longer used
447 Historical and geographic variations, modern nongeographic
variations of French
448 Standard French usage (Prescriptive linguistics)
449 Occitan Catalan, Franco-Provençal
450 Italian, Romanian, & related languages
450 Italian, Dalmatian, Romanian, Rhaetian, Sardinian, Corsican
451 Writing systems, phonology, phonetics of standard Italian
452 Etymology of standard Italian
453 Dictionaries of standard Italian
454 Not assigned or no longer used
455 Grammar of standard Italian
456 Not assigned or no longer used
457 Historical & geographic variations, modern nongeographic
variations of Italian
458 Standard Italian usage (Prescriptive linguistics)
459 Romanian, Rhaetian, Sardinian, Corsican
460 Spanish, Portuguese, Galician
460 Spanish, Portuguese, Galician
461 Writing systems, phonology, phonetics of standard Spanish
462 Etymology of standard Spanish
463 Dictionaries of standard Spanish
464 Not assigned or no longer used
465 Grammar of standard Spanish
466 Not assigned or no longer used
467 Historical & geographic variations, modern nongeographic
variations of Spanish
468 Standard Spanish usage (Prescriptive linguistics)
469 Portuguese
470 Latin & Italic languages
470 Latin & related Italic languages
471 Writing systems, phonology, phonetics of classical Latin
472 Etymology of classical Latin
473 Dictionaries of classical Latin
474 Not assigned or no longer used
475 Grammar of classical Latin
476 Not assigned or no longer used
477 Old, postclassical, Vulgar Latin
478 Classical Latin usage (Prescriptive linguistics)
479 Other Italic languages
480 Classical & modern Greek languages
480 Classical Greek & related Hellenic languages
481 Writing systems, phonology, phonetics of classical Greek
482 Etymology of classical Greek
483 Dictionaries of classical Greek
484 Not assigned or no longer used
485 Grammar of classical Greek
486 Not assigned or no longer used
487 Preclassical & postclassical Greek
488 Classical Greek usage (Prescriptive linguistics)
489 Other Hellenic languages
490 Other languages
490 Other languages
491 East Indo-European & Celtic languages
492 Afro-Asiatic languages
493 Non-Semitic Afro-Asiatic languages
494 Altic, Uralic, Hyperborean, Dravidian languages,
miscellaneous languages of south Asia
495 Languages of East & Southeast Asia
496 African languages
497 North American native languages
498 South American native languages
499 Non-Austronesian languages of Oceania, Austronesian
languages, miscellaneous languages

Class 500 – Science

500 Science
500 Natural sciences & mathematics
501 Philosophy & theory
502 Miscellany
503 Dictionaries, encyclopedias, concordances
504 Not assigned or no longer used
505 Serial publications
506 Organizations & management
507 Education, research, related topics
508 Natural history
509 History, geographic treatment, biography
510 Mathematics
510 Mathematics
511 General principles of mathematics
512 Algebra
513 Arithmetic
514 Topology
515 Analysis
516 Geometry
517 Not assigned or no longer used
518 Numerical analysis
519 Probabilities & applied mathematics
520 Astronomy
520 Astronomy & allied sciences
521 Celestial mechanics
522 Techniques, procedures, apparatus, equipment, materials
523 Specific celestial bodies & phenomena
524 Not assigned or no longer used
525 Earth (Astronomical geography)
526 Mathematical geography
527 Celestial navigation
528 Ephemerides
529 Chronology
530 Physics
530 Physics
531 Classical mechanics
532 Fluid mechanics
533 Pneumatics (Gas mechanics)
534 Sound & related vibrations
535 Light & related radiation
536 Heat
537 Electricity & electronics
538 Magnetism
539 Modern physics
540 Chemistry
540 Chemistry & allied sciences
541 Physical chemistry
542 Techniques, procedures, apparatus, equipment, materials
543 Analytical chemistry
544 No longer used—formerly Qualitative analysis
545 No longer used—formerly Quantitative analysis
546 Inorganic chemistry
547 Organic chemistry
548 Crystallography
549 Mineralogy
550 Earth sciences & geology
550 Earth sciences
551 Geology, hydrology, meteorology
552 Petrology
553 Economic geology
554 Earth sciences of Europe
555 Earth sciences of Asia
556 Earth sciences of Africa
557 Earth sciences of North America
558 Earth sciences of South America
559 Earth sciences of Australasia, Pacific Ocean islands,
Atlantic Ocean islands, Arctic islands, Antarctica, extraterrestrial worlds
560 Fossils & prehistoric life
560 Paleontology
561 Paleobotany; fossil microorganisms
562 Fossil invertebrates
563 Miscellaneous fossil marine & seashore invertebrates
564 Fossil Mollusca & Molluscoidea
565 Fossil Arthropoda
566 Fossil Chordata
567 Fossil cold-blooded vertebrates
568 Fossil Aves (birds)
569 Fossil Mammalia
570 Biology
570 Biology
571 Physiology & related subjects
572 Biochemistry
573 Specific physiological systems in animals, regional
histology & physiology in animals
574 Not assigned or no longer used
575 Specific parts of & physiological systems in plants
576 Genetics and evolution
577 Ecology
578 Natural history of organisms & related subjects
579 Natural history of microorganisms, fungi, algae
580 Plants
580 Plants
581 Specific topics in natural history of plants
582 Plants noted for specific vegetative characteristics and flowers
583 Magnoliopsida (Dicotyledones)
584 Liliopsida (Monocotyledones)
585 Pinophyta (Gymnosperms)
586 Cryptogamia (Seedless plants)
587 Pteridophyta
588 Bryophyta
589 No longer used—formerly Forestry
590 Animals (Zoology)
590 Animals
591 Specific topics in natural history of animals
592 Invertebrates
593 Miscellaneous marine & seashore invertebrates
594 Mollusca & Molluscoidea
595 Arthropoda
596 Chordata
597 Cold-blooded vertebrates
598 Aves (Birds)
599 Mammalia (Mammals)

Class 600 – Technology

600 Technology
600 Technology (Applied sciences)
601 Philosophy & theory
602 Miscellany
603 Dictionaries, encyclopedias, concordances
604 Technical drawing, hazardous materials technology; groups of
people
605 Serial publications
606 Organizations
607 Education, research, related topics
608 Patents
609 History, geographic treatment, biography
610 Medicine & health
610 Medicine & health
610.3 Medical encyclopedias
610.6 Medical organizations & professions
610.72 Medical research
610.9 Geography and history of medicine
611 Human anatomy, cytology, histology
611.2 Respiratory (lung, respiratory system)
611.3 Gastrointestinal (dental anatomy)
611.6 Genitourinary (genital system)
611.7 Musculoskeletal (seed coat)
611.8 Anatomy of the sense organs and nervous system
611.82 Anatomy of the brain
611.9 Topographic anatomy (back)
612 Human physiology
613 Personal health & safety
613.023 Professions hygiene and health
613.1 Role of the natural environment
613.2 Diet (food hygiene, nutrition, diet, nutritional value
of food and beverages)
613.4 Cleanliness Care (hygiene and personal cleanliness,
personal care)
613.5 Role of unnatural environment (housing, housing,
temperature)
613.6
613.62 Hygiene in the business (industrial hygiene)
613.66 Self Defense
613.7 Condition physique (bodybuilding, fitness, forme
physique)[4]
613.7046 Hatha yoga, yoga physique[5]
613.71 Exercising, sports (aerobics, sauna, appearance
surveillance and physical form)[6]
613.79 Relaxation, sleep[7]
614 Forensic medicine; incidence of injuries, wounds, disease;
public preventive medicine
615 Pharmacology and therapeutics
616 Diseases
617 Surgery, regional medicine, dentistry, ophthalmology,
otology, audiology
618 Gynecology, obstetrics, pediatrics, geriatrics
619 No longer used—formerly Experimental medicine
620 Engineering
620 Engineering & Applied operations
621 Applied physics
622 Mining & related operations
623 Military & nautical engineering
624 Civil engineering
625 Engineering of railroads, roads
626 Not assigned or no longer used
627 Hydraulic engineering
628 Sanitary engineering
629 Other branches of engineering
630 Agriculture
630 Agriculture & related technologies
631 Specific techniques; apparatus, equipment, materials
632 Plant injuries, diseases, pests
633 Field & plantation crops
634 Orchards, fruits, forestry
635 Garden crops (Horticulture)
636 Animal husbandry
637 Processing dairy & related products
638 Insect culture
639 Hunting, fishing, conservation, related technologies
640 Home & family management
640 Home & family management
641 Food & drink
642 Meals & table service
643 Housing & household equipment
644 Household utilities
645 Household furnishings
646 Sewing, clothing, management of personal and family life
647 Management of public households (Institutional housekeeping)
648 Housekeeping
649 Child rearing; home care of people with disabilities & illnesses
650 Management & public relations
650 Management & auxiliary services
651 Office services
652 Processes of written communication
653 Shorthand
654–656 Not assigned or no longer used
657 Accounting
658 General management
659 Advertising & public relations
660 Chemical engineering
660 Chemical engineering & related technologies
661 Technology of industrial chemicals
662 Technology of explosives, fuels, related products
663 Beverage technology
664 Food technology
665 Technology of industrial oils, fats, waxes, gases
666 Ceramic & allied technologies
667 Cleaning, color, coating, related technologies
668 Technology of other organic products
669 Metallurgy
670 Manufacturing
670 Manufacturing
671 Metalworking processes & primary metal products
672 Iron, steel, other iron alloys
673 Nonferrous metals
674 Lumber processing, wood products, cork
675 Leather & fur processing
676 Pulp & paper technology
677 Textiles
678 Elastomers & elastomer products
679 Other products of specific kinds of materials
680 Manufacture for specific uses
680 Manufacture of products for specific uses
681 Precision instruments & other devices
682 Small forge work (Blacksmithing)
683 Hardware & household appliances
684 Furnishings & home workshops
685 Leather & fur goods, & related products
686 Printing & related activities
687 Clothing & accessories
688 Other final products, & packaging technology
689 Not assigned or no longer used
690 Construction of buildings
690 Construction of buildings
691 Building materials
692 Auxiliary construction practices
693 Construction in specific types of materials & for specific
purposes
694 Wood construction
695 Roof covering
696 Utilities
697 Heating, ventilating, air-conditioning engineering
698 Detail finishing
699 Not assigned or no longer used

Class 700 – Arts & recreation

700 Arts
700 The Arts
701 Philosophy & theory of fine & decorative arts
702 Miscellany of fine & decorative arts
703 Dictionaries, encyclopedias, concordances of fine &
decorative arts
704 Special topics in fine & decorative arts
705 Serial publications of fine & decorative arts
706 Organizations & management of fine & decorative arts
707 Education, research, related topics of fine & decorative arts
708 Galleries, museums, private collections of fine & decorative
arts
709 History, geographic treatment, biography
710 Area planning & landscape architecture
710 Area planning & landscape architecture
711 Area planning (Civic art)
712 Landscape architecture (Landscape design)
713 Landscape architecture of trafficways
714 Water features in landscape architecture
715 Woody plants in landscape architecture
716 Herbaceous plants in landscape architecture
717 Structures in landscape architecture
718 Landscape design of cemeteries
719 Natural landscapes
720 Architecture
720 Architecture
721 Architectural materials & structural elements
722 Architecture from earliest times to ca. 300
723 Architecture from ca. 300 to 1399
724 Architecture from 1400
725 Public structures
726 Buildings for religious & related purposes
727 Buildings for educational & research purposes
728 Residential & related buildings
729 Design & decoration of structures & accessories
730 Sculpture, ceramics, & metalwork
730 Sculpture & related arts
731 Processes, forms, subjects of sculpture
732 Sculpture from earliest times to ca. 500, sculpture of
nonliterate peoples
733 Greek, Etruscan, Roman sculpture
734 Sculpture from ca. 500 to 1399
735 Sculpture from 1400
736 Carving & carvings
737 Numismatics & sigillography
738 Ceramic arts
739 Art metalwork
740 Graphic arts & decorative arts
740 Graphic arts
741 Drawing & drawings
742 Perspective in drawing
743 Drawing & drawings by subject
744 Not assigned or no longer used
745 Decorative arts
746 Textile arts
747 Interior decoration
748 Glass
749 Furniture & accessories
750 Painting
750 Painting & paintings
751 Techniques, procedures, apparatus, equipment, materials, forms
752 Color
753 Symbolism, allegory, mythology, legend
754 Genre paintings
755 Religion
756 Not assigned or no longer used
757 Human figures
758 Nature, architectural subjects & cityscapes, other specific
subjects
759 History, geographic treatment, biography
760 Printmaking & prints
760 Printmaking & prints
761 Relief processes (Block printing)
762 Not assigned or no longer used
763 Lithographic processes (Planographic processes)
764 Chromolithography & serigraphy
765 Metal engraving
766 Mezzotinting, aquatinting, & related processes
767 Etching & drypoint
768 Not assigned or no longer used
769 Prints
770 Photography, computer art, film, video
770 Photography, computer art, cinematography, videography
771 Techniques, procedures, apparatus, equipment, materials
772 Metallic salt processes
773 Pigment processes of printing
774 No longer used—formerly Holography
775 No longer used—formerly Digital photography
776 Computer art (Digital art)
777 Cinematography & Videography
778 Specific fields & special kinds of photography
779 Photographic images
780 Music
780 Music
781 General principles & musical forms
782 Vocal music
783 Music for single voices
784 Instruments & Instrumental ensembles & their music
785 Ensembles with only one instrument per part
786 Keyboard, mechanical, electrophonic, percussion instruments
787 Stringed instruments (Chordophones)
788 Wind instruments (Aerophones)
789 Not assigned or no longer used
790 Sports, games & entertainment
790 Recreational & performing arts
791 Public performances
792 Stage presentations
793 Indoor games & amusements
794 Indoor games of skill
795 Games of chance
796 Athletic & outdoor sports & games
797 Aquatic & air sports
798 Equestrian sports & animal racing
799 Fishing, hunting, shooting

Class 800 – Literature

800 Literature, rhetoric & criticism
800 Literature (Belles-lettres) & rhetoric
801 Philosophy & theory
802 Miscellany
803 Dictionaries, encyclopedias, concordances
804 Not assigned or no longer used
805 Serial publications
806 Organizations & management
807 Education, research, related topics
808 Rhetoric & collections of literary texts from more than two
literatures
809 History, description, critical appraisal of more than two
literatures
810 American literature in English
810 American literature in English
811 American poetry in English
812 American drama in English
813 American fiction in English
814 American essays in English
815 American speeches in English
816 American letters in English
817 American humor & satire in English
818 American miscellaneous writings in English
819 No longer used—formerly Puzzle activities
820 English & Old English literatures
820 English & Old English (Anglo-Saxon) literatures
821 English Poetry
822 English drama
823 English fiction
824 English essays
825 English speeches
826 English letters
827 English humor & satire
828 English miscellaneous writings
829 Old English (Anglo-Saxon) literature
830 German & related literatures
830 German literature & literatures of related languages
831 German poetry
832 German drama
833 German fiction
834 German essays
835 German speeches
836 German letters
837 German humor & satire
838 German miscellaneous writings
839 Other Germanic literatures
840 French & related literatures
840 French literature & literatures of related Romance languages
841 French poetry
842 French drama
843 French fiction
844 French essays
845 French speeches
846 French letters
847 French humor & satire
848 French miscellaneous writings
849 Occitan, Catalan, Franco-Provençal literatures
850 Italian, Romanian, & related literatures
850 Literatures of Italian, Dalmatian, Romanian, Rhaetian,
Sardinian, Corsican languages
851 Italian poetry
852 Italian drama
853 Italian fiction
854 Italian essays
855 Italian speeches
856 Italian letters
857 Italian humor & satire
858 Italian miscellaneous writings
859 Literatures of Romanian, Rhaetian, Sardinian, Corsican languages
860 Spanish, Portuguese, Galician literatures
860 Literatures of Spanish, Portuguese, Galician languages
861 Spanish poetry
862 Spanish drama
863 Spanish fiction
864 Spanish essays
865 Spanish speeches
866 Spanish letters
867 Spanish humor & satire
868 Spanish miscellaneous writings
869 Literatures of Portuguese & Galician languages
870 Latin & Italic literatures
870 Latin literature & literatures of related Italic languages
871 Latin poetry
872 Latin dramatic poetry & drama
873 Latin epic poetry & fiction
874 Latin lyric poetry
875 Latin speeches
876 Latin letters
877 Latin humor & satire
878 Latin miscellaneous writings
879 Literatures of other Italic languages
880 Classical & modern Greek literatures
880 Classical Greek literature & literatures of related Hellenic
languages
881 Classical Greek poetry
882 Classical Greek drama
883 Classical Greek epic poetry & fiction
884 Classical Greek lyric poetry
885 Classical Greek speeches
886 Classical Greek letters
887 Classical Greek humor & satire
888 Classical Greek miscellaneous writings
889 Modern Greek literature
890 Other literatures
890 Literatures of other specific languages and language families
891 East Indo-European & Celtic literatures
892 Afro-Asiatic literatures
893 Non-Semitic Afro-Asiatic literatures
894 Literatures of Altaic, Uralic, Hyperborean, Dravidian
languages; literatures of miscellaneous languages of Southeast Asia
895 Literatures of East & Southeast Asia
896 African literatures
897 Literatures of North American native languages
898 Literatures of South American native languages
899 Literatures of non-Austronesian languages of Oceania, of
Austronesian languages, of miscellaneous languages

Class 900 – History & geography
900 History

900 History, geography, & auxiliary disciplines
901 Philosophy & theory of history
902 Miscellany of history
903 Dictionaries, encyclopedias, concordances of history
904 Collected accounts of events
905 Serial publications of history
906 Organizations & management of history
907 Education, research, related topics of history
908 History with respect to groups of people
909 World history

910 Geography & travel

910 Geography & travel
911 Historical geography
912 Graphic representations of surface of earth and of
extraterrestrial worlds
913 Geography of & travel in ancient world
914 Geography of & travel in Europe
915 Geography of & travel in Asia
916 Geography of & travel in Africa
917 Geography of & travel in North America
918 Geography of & travel in South America
919 Geography of & travel in Australasia, Pacific Ocean islands,
Atlantic Ocean islands, Arctic islands, Antarctica, & on
extraterrestrial worlds

920 Biography & genealogy

920 Biography, genealogy, insignia
921–928 This range is reserved as an optional location for
biographies, which are shelved alphabetically by subject's last name.
929 Genealogy, names, insignia

930 History of ancient world (to ca. 499)

930 History of ancient world to ca. 499
931 China to 420
932 Egypt to 640
933 Palestine to 70
934 South Asia to 647
935 Mesopotamia to 637 & Iranian Plateau to 637
936 Europe north & west of Italian Peninsula to ca. 499
937 Italian Peninsula to 476 & adjacent territories to 476
938 Greece to 323
939 Other parts of ancient world

940 History of Europe

940 History of Europe
941 British Isles
942 England & Wales
943 Germany & neighboring central European countries
944 France & Monaco
945 Italy, San Marino, Vatican City, Malta
946 Spain, Andorra, Gibraltar, Portugal
947 Russia & neighboring east European countries
948 Scandinavia
949 Other parts of Europe

950 History of Asia

950 History of Asia
951 China & adjacent areas
952 Japan
953 Arabian Peninsula & adjacent areas
954 India & neighboring south Asian countries;
955 Iran
956 Middle East (Near East)
957 Siberia (Asiatic Russia)
958 Central Asia
959 Southeast Asia

960 History of Africa

960 History of Africa
961 Tunisia & Libya
962 Egypt, Sudan, South Sudan
963 Ethiopia & Eritrea
964 Morocco, Ceuta, Melilla Western Sahara, Canary Islands
965 Algeria
966 West Africa & offshore islands
967 Central Africa & offshore islands
968 Republic of South Africa & neighboring southern African countries
969 South Indian Ocean islands

970 History of North America

970 History of North America
971 Canada
972 Mexico, Central America, West Indies, Bermuda
973 United States
974 Northeastern United States (New England & Middle Atlantic states)
975 Southeastern United States (South Atlantic states)
976 South central United States
977 North central United States
978 Western United States
979 Great Basin & Pacific Slope region of United States

980 History of South America

980 History of South America
981 Brazil
982 Argentina
983 Chile
984 Bolivia
985 Peru
986 Colombia & Ecuador
987 Venezuela
988 Guiana
989 Paraguay & Uruguay

990 History of other areas

990 History of Australasia, Pacific Ocean islands, Atlantic Ocean
islands, Arctic islands, Antarctica, extraterrestrial worlds
991–992 Not assigned or no longer used
993 New Zealand
994 Australia
995 New Guinea & neighboring countries of Melanesia

996 Polynesia & other Pacific Ocean islands
997 Atlantic Ocean islands
998 Arctic islands & Antarctica
999 Extraterrestrial worlds



jonathon


moderated Re: Visibility in Privacy section of group Settings page - s/archive/message archive/

Frances
 

One problematic use still exists - on our group homepage it uses the term archive, as in  
Archives are visible to subscribers only.

Mark, can you add "message" to that too? Another question about "archives" on GMF.

Thanks.

Frances


moderated Re: Categories for groups -- idea suggestion

Al Ludwick / NN4ZZ
 

Hi Toby,
RE: The question, do we have categories or not?

There will likely be some owners that don’t like or want to categorize their group.  That is the reason I included the “Other and none specified” option.   But I think the majority will find one they like and use the feature to allow prospective members to more easily find their group.  

IMHO Keeping the list broad, and concise will make the search feature easy and practical to implement and use.

So my vote is YES, add the category feature.

Regards Al / NN4ZZ


moderated Re: Categories for groups -- idea suggestion

Toby Kraft
 

All - the category I suggest does not define what the group discusses, only an idea of the part of the cosmos that the members of the group align themselves with that leads them to have these discussions.  For example, parents and caregivers that want to discuss using nanny-cams - the playing field for them would most likely be "Home&Family" and keywords for their group might be "nanny-cam", "security cameras", "nanny", "baby monitor", etc, etc.  Even though security cameras are a technology thing, that's not why the group exists.  
...continuing the friendly discussion....
Linda - is the travel for pleasure or for business?  There could just as well be a travel group for business people in the Business & Finance category. A support group for a rare disease would fit well in Health with the name of the disease as one of the keywords.
Sharon - categories would not be hierarchical, not trying to create a taxonomy for everything, which as Yahoo learned is impossible.  We agree that tags are more useful for homing in on what the group is focused on (and keywords are not fixed or preset by groups.io, group owners define the keywords for their group).
Al and John - agree that 20 or so categories that we flesh out is about right.  
Very interesting discussion though and, having said all that, I think it boils down to one question - do the groups have a category or not, Yes or No?  We agree that tags have value so could just have tags defined by the group owner.  When searching, as you type a term, matching tags (and # of groups with that tag) are displayed to help you find groups of interest.
Thanks
Toby


moderated Re: Categories for groups -- idea suggestion

Al Ludwick / NN4ZZ
 

Hi John,
If there is just a single level of broad categories maybe allowing the owner to select more than one would address the concern.  With a small number of categories they would all be easily visible all at once and still avoid the multi-level issues.  This still maintains a short static list.   In this example, there are up to 3 allowed and 2 are selected.  


Regards,  Al / NN4ZZ  
al (at) nn4zz (dot) com


moderated Re: Categories for groups -- idea suggestion

John McLachlan
 

I'm warming to the idea of tags.

We get his this on FB a lot, which also has nested categories.  We put out model group under Hobby, and someone will suggest we change to Railroad, then someone else will suggest we go under Museum (open house and  all).   Same with the community garden.  Are we agriculture?  Or Community group?   

Keywords might allow more flexibility, as well as letting groups chose more than one keyword if they choose.


moderated Re: Categories for groups -- idea suggestion

Al Ludwick / NN4ZZ
 

Hi Sharon,
I agree on not liking Yahoo’s multilevel heirachy, it is confusing and too much duplication at the lower level.   That is why I suggested a short, broad, and single level of categories.   It would be easy to visualize all at once and make browsing more productive.   As an example, for browsing it could break up a thousand groups into shorter lists of maybe 30 to 100 groups per category.  The list of 20 Categories I suggested above is not perfect.  There have been some suggestions already to make a few of the entries broader and more inclusive while still keeping the list at around 20 entries.  

If Mark decides to implement this I think members could be asked to take a look and see if their group fits one of the categories or suggest how to modify one to be inclusive.  
I took a quick look through many of the groups here and it looked like they would align but more input could confirm or make them better.   And while continous updates to the list is not desirable modifications would be possible. 

Regards, Al 


moderated Deletion of (last) sub group changes address of (remaining) main group #bug

Jeremy H
 

When a sub group is added to mygroup@groups.io, then the main group will be changed to main@mygroup.groups.io (or as chosen) with mygroup@groups.io established as an alias.

If however the sub group (or if there were several, the last) is deleted, leaving only the main group, then this process is reversed, so the main@mygroup.groups.io address is deleted.

When I found this issue, it was in a test environment, so no problem, but in the case where the sub-group, and hence the main@mygroup.groups.io address, was long established, it would cause problems. So I believe this should not happen, and the main@mygroup.groups.io address should remain - as essentially a main group without any sub-groups.

Jeremy

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