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- A - General Reference Works and Journals (7)
- AC - General Collections and Collected Works (6,359)
- AE - Encyclopedias (543)
- AG - Dictionaries and other general reference works (467)
- AI - General Indexes (242)
- AM - Museums and Collecting (670)
- AN - Newspapers (30)
- AP - Periodicals (3,041)
- AS - Academies (7,459)
- AY - Yearbooks, Almanacs, Directories (580)
- AZ - History of Scholarship (471)
- B - Philosophy (General) (35,611)
- BC - Logic (1,809)
- BD - Speculative Philosophy (5,078)
- BF - Psychology (21,844)
- BH - Aesthetics (1,668)
- BJ - Ethics (6,194)
- BL - Religions, Mythology, Rationalism (23,397)
- BM - Judaism (6,032)
- BP - Islam, Bahaism, Theosophy (11,476)
- BQ - Buddhism (11,720)
- BR - Christianity (16,096)
- BS - The Bible (17,318)
- BT - Doctrinal Theology (10,282)
- BV - Practical Theology (11,287)
- BX - Christian Denominations (35,341)
- C - Auxiliary Sciences of History (General) (36)
- CB - History of Civilization (3,433)
- CC - Archaeology (1,414)
- CD - Diplomatics, Archives, Seals (3,465)
- CE - Technical Chronology, Calendar (264)
- CJ - Numismatics (1,420)
- CN - Inscriptions, Epigraphy (881)
- CR - Heraldry (841)
- CS - Genealogy (4,115)
- CT - Biography (5,650)
- D - History (General) (34,351)
- DA - History : Great Britain (22,887)
- DAW - History : Central Europe (68)
- DB - History : Austria, Liechtenstein, Hungary, Czechoslovakia (5,592)
- DC - History : France, Andorra, Monaco (15,945)
- DD - History : Germany (17,261)
- DE - History : Greco-Roman World (1,023)
- DF - History : Greece (4,785)
- DG - History : Italy, Malta (16,084)
- DH - History : Low Countries--Benelux Countries (1,059)
- DJ - History : Netherlands (Holland) (707)
- DJK - History : Eastern Europe (General) (779)
- DK - History : Russia, Soviet Union, Former Soviet Republics, Poland (20,002)
- DL - History : Northern Europe, Scandinavia (1,714)
- DP - History : Spain, Portugal (8,334)
- DQ - History : Switzerland (914)
- DR - History : Balkan Peninsula (6,562)
- DS - History : Asia (68,334)
- DT - History : Africa (22,237)
- DU - History : Australia, New Zealand, South Pacific islands (3,271)
- DX - History : Romanies (211)
- E11-E143 - History : America (9,579)
- E151-E904 - History : United States (52,209)
- F1-F975 - United States local history (33,636)
- F1001-F1146 - History, British America (including Canada) and Dutch America (3,102)
- F1170-F1170 - History, French America (7)
- F1201-F3799 - History, Latin America and Spanish America (34,180)
- G - Geography (General ). Atlases, Maps (18,906)
- GA - Mathematical geography. Cartography (912)
- GB - Physical Geography (4,078)
- GC - Oceanography (1,672)
- GE - Geographic aspects of Environmental Sciences (1,700)
- GF - Human Ecology and Anthropogeography (1,411)
- GN - Anthropology (11,205)
- GR - Folklore (5,638)
- GT - Manners and Customs (3,312)
- GV1-GV100 - Recreation and Leisure (376)
- GV1199-GV1570 - Games and Hobbies (784)
- GV1580-GV1799 - Dance (1,674)
- GV1800-GV1860 - Circuses, Amusement Parks, etc. (253)
- GV201-GV1198 - Sports and Physical Education (5,487)
- H - Social Sciences (General) (6,238)
- HA - Social Science Statistics (3,812)
- HB - Economic Theory and Demography (22,690)
- HC - Economic History and Conditions (41,546)
- HD - Industries, Land Use, Labor (75,457)
- HE - Transportation and Communications (9,925)
- HF - Commerce (29,444)
- HG - Finance (21,927)
- HJ - Public Finance (8,661)
- HM - Sociology (General) (11,114)
- HN - Social History and Conditions. Social problems. Social reform. (14,213)
- HQ - Family, Marriage, Women (26,036)
- HS - Societies : Secret, benevolent. (1,479)
- HT - Communities, Classes, Races (11,218)
- HV - Social Pathology. Social and public welfare. Criminology (28,415)
- HX - Socialism, Communism, Anarchism (11,241)
- J - General Legislative and Executive Papers (2,264)
- JA - Political Science (General) (4,656)
- JC - Political Theory (12,734)
- JF - Government (General) (3,200)
- JJ - Government : North America (1)
- JK - Government : United States (11,604)
- JL - Government : Canada, Latin America (3,494)
- JN - Government : Europe (14,846)
- JQ - Government : Asia, Africa, Australia, Pacific (7,376)
- JS - Local and Municipal Government (4,733)
- JV - Colonies, Emigration, Immigration (3,041)
- JX - International Law (12,629)
- JX - International Law (obsolete) (2)
- JZ - International Relations (2,477)
- K - Law (General). Comparative and uniform law. Jurisprudence (18,398)
- KB - Religious Law (General). Comparative religious law. (725)
- KBM - Jewish Law (81)
- KBP - Islamic Law (231)
- KBR - History of Canon Law (81)
- KBU - Law of the Roman Catholic Church (75)
- KD - Law : United Kingdom and Ireland (8,765)
- KDZ - Law : America. North America (General) (156)
- KE - Law : Canada (2,351)
- KF - Law : United States (70,933)
- KG - Law : Latin America and the Caribbean (135)
- KG - Law : Latin America-Mexico and Central America-West Indies. Caribbean area (538)
- KH - Law : South America (613)
- KJ-KK - Law : Europe (7,092)
- KL-KW - Law : Asia and Eurasia, Africa, Pacific Area, and Antarctica (5,977)
- KL-KW - Law of nations (134)
- KZ - Law of nations (2,834)
- L - Education (General) (1,975)
- LA - History of Education (8,666)
- LB - Theory and Practice of Education (40,376)
- LC - Special Aspects of Education (16,522)
- LD - Educational institutions : United States (3,859)
- LE - Educational institutions : America (except United States) (172)
- LF - Educational institutions : Europe (1,291)
- LG - Educational institutions : Asia, Africa, Indian Ocean islands, Australia, New Zealand, Pacific islands (379)
- LH - School Magazine and Papers (279)
- LJ - Student Fraternities and Societies : United States (265)
- LT - Textbooks (31)
- M - Music (General) (47,442)
- ML - Literature on Music (32,027)
- MT - Music : Instruction and Study (4,511)
- N - Visual Arts (37,364)
- NA - Architecture (32,532)
- NB - Sculpture (7,033)
- NC - Drawing, Design, Illustration (6,396)
- ND - Painting (28,379)
- NE - Print Media (4,163)
- NK - Decorative Arts (9,879)
- NX - Arts (General) (3,911)
- P - Philology, Linguistics (14,557)
- PA - Language and Literature : Latin and Greek (23,770)
- PB - Modern and Celtic Languages (1,602)
- PC - Romance Languages (10,485)
- PD - Germanic Languages (1,405)
- PE - English Languages (8,816)
- PF - West Germanic Languages (3,047)
- PG - Slavic, Baltic, Abanian Languages (35,935)
- PH - Uralic, Basque Languages (1,195)
- PJ - Oriental Languages and literatures (15,068)
- PK - Indo-Iranian Languages and literatures (25,663)
- PL - Eastern Asia, Africa, Oceania Languages and literatures (21,770)
- PM - Hyperborean, Indian, and Artificial Languages (1,628)
- PN1-PN1009 - Literature (General) (14,616)
- PN1-PN1009 - Literature in General (243)
- PN1010-PN1389 - Poetry (55)
- PN1010-PN1525 - Poetry (1,993)
- PN1530-PN1988 - Drama (2,095)
- PN1990-PN1992 - Broadcasting, Radio, Television (362)
- PN1993-PN1999 - Motion Pictures (10,773)
- PN2000-PN3307 - Theater and Acting (9,357)
- PN3311-PN4500 - Prose - Fiction, Essays, Diaries, Letters, etc. (3,516)
- PN4390-PN4500 - Diaries, Letters, Essays (34)
- PN4699-PN5650 - Journalism (6,434)
- PN6700-PN6790 - Graphic Novels (1,098)
- PN6700-PN6790 - Graphic Novels, Comic Books and Strips (160)
- PQ - French, Italian, Spanish, Portuguese Literature (120,307)
- PR - English Literature (excludes American literature) (117,014)
- PS - American Literature (146,336)
- PT - German, Dutch and Scandinavian Literatures (53,649)
- PZ - Children and Young Adult Literature (17,401)
- Q - Science (General) (12,927)
- QA - Mathematics (55,094)
- QB - Astronomy (9,226)
- QC - Physics (22,755)
- QD - Chemistry (10,443)
- QE - Geology (9,850)
- QH - Natural History and Biology (16,463)
- QK - Botany (5,917)
- QL - Zoology (11,268)
- QM - Human Anatomy (1,203)
- QP - Physiology (10,203)
- QR - Microbiology (2,633)
- R - Medicine(General) (7,837)
- RA - Public Medicine (11,044)
- RB - Pathology (1,387)
- RC - Internal Medicine (22,843)
- RD - Surgery (4,711)
- RE - Ophthalmology (1,045)
- RF - Otorhinolarynhology (878)
- RG - Gynecology and Obstetrics (2,573)
- RJ - Pediatrics (5,207)
- RK - Dentistry (352)
- RL - Dermatology (421)
- RM - Therapeutics and Pharmacology (3,015)
- RS - Pharmacy and materia medica (1,324)
- RT - Nursing (1,807)
- RV - Botanic, Thomsonian, Eclectic Medicine (15)
- RX - Homeopathy (100)
- RZ - Other Systems of Medicine (172)
- S - Agriculture (General) (7,193)
- SB - Plant Culture (8,521)
- SD - Forestry (2,994)
- SF - Animal Culture (3,921)
- SH - Aquaculture, Fisheries, Angling (1,674)
- SK - Hunting Sports (1,322)
- T - Technology (General) (7,642)
- TA - General and Civil Engineering (13,946)
- TC - Hydraulic and Ocean Engineering (2,658)
- TD - Environmental Technology and Sanitary engineering (6,894)
- TE - Highway Engineering, Roads and pavements (1,931)
- TF - Railroad Engineering and Operation (1,497)
- TG - Bridge Engineering (715)
- TH - Building Construction (3,386)
- TJ - Mechanical Engineering and Machinery (5,970)
- TK - Electrical and Nuclear Engineering, Electronics (18,212)
- TL - Motor Vehicles, Aeronautics and Astronautics (6,764)
- TN - Mining Engineering and Metallurgy (5,570)
- TP - Chemical Technology (5,886)
- TR - Photography (6,386)
- TS - Manufactures (4,651)
- TT - Arts and Crafts (1,274)
- TX - Home Economics (4,663)
- U - Military Science (4,534)
- V - Naval Science (735)
- W - Health Sciences (9)
- Z - Books (General), Writing, Paleography, Book industries and trade, Libraries, Bibliography. (1)
- Z1001-Z8999 - Bibliographies (36,592)
- Z4-Z659 - Books, Printing and Publishing. Writing and Manuscripts. (13,490)
- Z662-Z1000 - Libraries (11,819)
- ZA - Information Resources (General) (281)