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A - General Works
- AC - Collections. Series. Collected works.
- AE - Encyclopedias (General).
- AG - Dictionaries and other general reference works.
- AI - Indexes (General).
- AM - Museums (General). Collectors and collecting (General).
- AN - Newspapers.
- AP - Periodicals (General).
- AS - Academies and learned societies (General).
- AY - Yearbooks. Almanacs. Directories for general works only.
- AZ - History of Scholarship and learning.
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B - Philosophy. Psychology. Religion.
- B - Philosophy (General).
- BC - Logic.
- BD - Speculative Philosophy.
- BF - Psychology.
- BH - Aesthetics.
- BJ - Ethics.
- BL - Religions. Mythology. Rationalism.
- BM - Judaism.
- BP - Islam. Bahaism. Theosophy, etc.
- BQ - Buddhism.
- BR - Christianity (General).
- BS - The Bible and exegesis.
- BT - Doctrinal theology. Apologetics.
- BV - Practical theology.
- BX - Denominations and sects
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C - Auxiliary Sciences of History
- C - Auxiliary sciences of history (General).
- CB - History of civilization and culture (General).
- CC - Archaeology (General).
- CD - Diplomatics. Archives. Seals.
- CE - Technical chronology. Calendar.
- CJ - Numismatics
- CN - Epigraphy. Inscriptions.
- CR - Heraldry.
- CS - Genealogy.
- CT - Biography.
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D - History: General and Old World
- D - History (General).
- DA - Great Britian.
- DB - Austria. Czechoslovakia. Hungary.
- DC - France.
- DD - Germany.
- DE - The Mediterranean region.
- DF - Greece.
- DG - Italy.
- DH - Netherlands.
- DI - Belgium.
- DJ - Luxemburg.
- DK - Russia
- DL - Northern Europe. Scandinavia.
- DP - Spain. Portugal.
- DQ - Switzerland.
- DR - Eastern Europe. Balkan Peninsula. Turkey.
- DS - Asia.
- DT - Africa.
- DU - Oceania (South Seas).
- DX - Gypsies.
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E & F - History: America
- E - America (General).
- F - United States local history
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G - Geography: Anthropology. Recreation.
- G - Geography.
- GA - Mathematical geography. Cartography.
- GB - Physical geography.
- GC - Oceanography.
- GF - Human Ecology.
- GN - Anthropology.
- GR - Folklore.
- GT - Manners and customs (General).
- GV - Recreation
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H - Social Sciences.
- H - Social Sciences (General).
- HA - Statistics.
- HB - Economics.
- HC - Economic history and conditions. National production.
- HD - Land. Agriculture. Industry.
- HE - Transportation and communication.
- HF - Commerce.
- HG - Finance.
- HJ - Public finance.
- HM - Sociology
- HN - Social history. Social problems. Social reform.
- HQ - Sexual life.
- HS - Societies: Secret, benevolent, etc.
- HT - Communities. Classes. Races.
- HV - Social pathology. Social and public welfare.
- HX - Socialism. Communism. Anarchism.
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J - Political Science.
- J - Official documents.
- JA - Collection and general works.
- JC - Political theory. Theory of the state.
- JF - General works. Comparative works.
- JK - United States.
- JL - British America. Latin America.
- JN - Europe.
- JQ - Asia. Africa. Australia. Oceania.
- JS - Local government.
- JV - Colonies and colonization. Emigration and immigration.
- JX - International law. International relations.
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K - Law.
- KD - Law of England and Wales.
- KDC - Law of Scotland.
- KDE - Law of Northern Ireland.
- KDG - Law of Isle of Man and the Channel Islands.
- KDK - Law of Ireland.
- KF - Federal law of the United States. Common and collective state law.
- KFA-KFW -Law of individual states.
- KFX - Law of individual cities, A-Z.
- KFZ - Law of individual territories.
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L - Education.
- L - Education.
- LA - History of Education.
- LB - Theory and practice of education.
- LC - Special aspects of education.
- LD - United States.
- LE - America, except United States.
- LF - Europe.
- LG - Asia. Africa. Oceania.
- LH - College and school magazines and papers.
- LJ - Student fraternities and societies, United States.
- LT - Textbooks.
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M - Music and Books on Music.
- M - Music
- ML - Literature of music.
- MT - Music instruction and study.
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N - Fine Arts
- N - Visual Arts (General).
- NA - Architecture.
- NB - Sculpture.
- NC - Drawing. Design. Illustration.
- ND - Painting.
- NE - Print Media.
- NK - Decorative arts. Applied arts. Decoration and ornament.
- NX - Arts in General.
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P - Language and literature.
- P - Philology and linguistics (General).
- PA - Classical languages and literatures.
- PB - Celtic languages and literatures.
- PC - Romance languages.
- PD - Germanic languages.
- PE - English.
- PF - West Germanic.
- PG - Slavic. Baltic, Albanian languages and literatures.
- PH - Finno-Ugrian, Basque languages and literatures.
- PJ - Oriental languages and literatures.
- PK - Indo-Iranian.
- PL - Languages and literatures of Eastern Asia, Africa, Oceania.
- PM - American Indian
- PN - Literary history and collections (General).
- PQ - Romance literatures.
- PR - English literature.
- PS - American literature.
- PT - Germanic literature.
- PZ - Fiction and juvenile literature.
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Q - Science
- Q - Science (General).
- QA - Mathematics.
- QB - Astronomy.
- QC - Physics.
- QD - Chemistry.
- QE - Geology.
- QH - Natural History (General).
- QK - Botany.
- QL - Zoology.
- QM - Human Anatomy.
- QP - Physiology.
- QR - Microbiology.
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R - Medicine.
- R - Medicine.
- RA - Public aspects of medicine.
- RB - Pathology.
- RC - Internal medicine. Practice of medicine.
- RD - Surgery.
- RE - Ophthalmology.
- RF - Otorhinolaryngology.
- RG - Gynecology and obstetrics.
- RG - Pediatrics.
- RK - Dentistry.
- RL - Dermatology.
- RM - Therapeutics. Pharmacology.
- RS - Pharmacy and material medica.
- RT - Nursing.
- RV - Botanic, Thomsonian, and eclectic medicine.
- RX - Homeopathy.
- RZ - Other systems of medicine.
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S - Agriculture.
- S - Agriculture (General).
- SB - Plant culture.
- SD - Forestry.
- SF - Animal culture.
- SH - Aquaculture. Fisheries. Angling.
- SK - Hunting.
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T - Technology.
- T - Technology.
- TA - Engineering (General). Civil engineering (General).
- TC - Hydraulic engineering.
- TD - Environmental technology. Sanitary.
- TE - Highway engineering and operation.
- TF - Railroad engineering and operation.
- TG - Bridge engineering.
- TH - Building construction.
- TJ - Mechanical engineering and machinery.
- TK - Electrical engineering. Electronics. Nuclear Engineering.
- TL - Motor Vehicles.
- TN - Mining Engineering. Metallurgy.
- TP - Chemical technology.
- TR - Photography.
- TS - Manufactures.
- TT - Handicrafts. Arts and crafts.
- TX - Home economics.
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U - Military Science.
- U - Military science (General).
- UA - Armies: Organization, description, facilities, etc.
- UB - Military administration
- UC - Maintenance and transportation.
- UD - Infantry.
- UE - Cavalry. Armored and mechanized cavalry.
- UF - Artillery.
- UG - Military engineering.
- UH - other services.
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V - Naval Services.
- V - Naval services.
- VA - Navies: Organization, description, facilities, etc.
- VB - Naval administration.
- VC - Naval maintenance.
- VD - Naval seamen.
- VE - Marines.
- VG - Minor services of navies.
- VK - Navigation. Merchant marine.
- VM - Naval architecture. Shipbuilding. Marine engineering.
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Z - Bibliography. Library Science.
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