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Library of Congress Subject Areas (20724)
- A General Works (33)
  - AC Collections. Series. Collected works (1)
  - AM Museums (General). Collectors and collecting (General) (16)
  - AS Academies and learned societies (General) (3)
  - AZ History of Scholarship The Humanities (15)
- B Philosophy. Psychology. Religion (2466)
  - B Philosophy (General) (19)
  - BF Psychology (2362)
  - BJ Ethics (41)
  - BL Religion (58)
  - BP Islam. Bahaism. Theosophy, etc (9)
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  - BR Christianity (10)
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  - BT Doctrinal Theology (1)
  - BV Practical Theology (2)
- C Auxiliary Sciences of History (242)
  - C Auxiliary sciences of history (General) (3)
  - CB History of civilization (28)
  - CC Archaeology (224)
  - CD Diplomatics. Archives. Seals (4)
    - CD921 Archives (3)
  - CT Biography (1)
- D History General and Old World (125)
  - D History (General) (99)
    - D051 Ancient History (1)
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    - D501 World War I (7)
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    - D839 Post-war History, 1945 on (11)
    - D901 Europe (General) (1)
  - DA Great Britain (50)
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  - DS Asia (6)
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- E History America (18)
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  - E151 United States (General) (6)
- F History United States, Canada, Latin America (5)
  - F001 United States local history (2)
  - F1201 Latin America (General) (3)
- G Geography. Anthropology. Recreation (2355)
  - G Geography (General) (224)
    - G149 Travel. Voyages and travels (General) (154)
      - G154.9 Travel and state. Tourism (144)
  - GA Mathematical geography. Cartography (4)
  - GB Physical geography (67)
  - GC Oceanography (47)
  - GE Environmental Sciences (1029)
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  - GN Anthropology (209)
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  - GT Manners and customs (84)
    - GT500 Costume. Dress. Fashion (65)
  - GV Recreation Leisure (824)
    - GV1580 Dancing (14)
    - GV561 Sports (753)
      - GV711 Coaching (183)
- H Social Sciences (3085)
  - H Social Sciences (General) (348)
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  - HN Social history and conditions. Social problems. Social reform (166)
  - HQ The family. Marriage. Woman (123)
  - HS Societies secret benevolent etc (6)
  - HT Communities. Classes. Races (156)
  - HV Social pathology. Social and public welfare. Criminology (753)
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  - HX Socialism. Communism. Anarchism (2)
- J Political Science (207)
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  - JV Colonies and colonization. Emigration and immigration. International migration (12)
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- K Law (383)
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- L Education (1281)
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    - LB2300 Higher Education (407)
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  - LC Special aspects of education (160)
    - LC5201 Education extension. Adult education. Continuing education (13)
  - LD Individual institutions (United States) (2)
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  - LG Individual institutions (Asia. Africa) (12)
- M Music and Books on Music (65)
  - M Music (56)
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- N Fine Arts (543)
  - N Visual arts (General) For photography, see TR (203)
  - N4390-5098 Exhibitions (19)
  - NA Architecture (127)
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  - NX Arts in general (176)
- P Language and Literature (405)
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  - PN Literature (General) (348)
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    - PN1993 Motion Pictures (72)
    - PN2000 Dramatic representation. The Theater (23)
    - PN4699 Journalism (57)
  - PR English literature (15)
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  - PZ Childrens literature (2)
- Q Science (7025)
  - Q Science (General) (76)
  - QA Mathematics (1700)
    - QA75 Electronic computers. Computer science (1369)
    - QA76 Computer software (508)
  - QB Astronomy (2526)
  - QC Physics (1990)
  - QD Chemistry (544)
  - QE Geology (100)
    - QE701 Paleontology (47)
  - QH Natural history (1528)
    - QH301 Biology (1144)
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  - QM Human anatomy (155)
  - QP Physiology (437)
  - QR Microbiology (157)
    - QR180 Immunology (20)
    - QR355 Virology (15)
- R Medicine (6950)
  - R Medicine (General) (632)
  - RA Public aspects of medicine (2017)
    - RA0421 Public health. Hygiene. Preventive Medicine (1595)
      - RA0440 Study and Teaching. Research (129)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (129)
    - RA1190 Toxicology. Poisions (84)
  - RB Pathology (9)
  - RC Internal medicine (2879)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (139)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (417)
    - RC1200 Sports Medicine (2321)
  - RD Surgery (54)
  - RE Ophthalmology (20)
  - RF Otorhinolaryngology (4)
  - RG Gynecology and obstetrics (220)
  - RJ Pediatrics (274)
    - RJ101 Child Health. Child health services (193)
  - RK Dentistry (31)
  - RL Dermatology (22)
  - RM Therapeutics. Pharmacology (1123)
  - RS Pharmacy and materia medica (754)
  - RT Nursing (356)
  - RV Botanic, Thomsonian, and eclectic medicine (143)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (30)
- S Agriculture (210)
  - S Agriculture (General) (94)
  - SB Plant culture (22)
  - SD Forestry (15)
  - SF Animal culture (53)
  - SH Aquaculture. Fisheries. Angling (43)
- T Technology (3231)
  - T Technology (General) (647)
    - T58.5 Information Technology (30)
  - TA Engineering (General). Civil engineering (General) (1568)
  - TC Hydraulic engineering. Ocean engineering (191)
  - TD Environmental technology. Sanitary engineering (301)
  - TE Highway engineering. Roads and pavements (72)
  - TF Railroad engineering and operation (10)
  - TG Bridge engineering (8)
  - TH Building construction (352)
  - TJ Mechanical engineering and machinery (199)
  - TK Electrical engineering. Electronics. Nuclear engineering (359)
  - TL Motor vehicles. Aeronautics. Astronautics (64)
  - TN Mining engineering. Metallurgy (33)
  - TP Chemical technology (109)
  - TR Photography (30)
  - TS Manufactures (27)
  - TT Handicrafts Arts and crafts (6)
    - TT490 Clothing manufacture. Dressmaking.Tailoring (3)
  - TX Home economics (327)
    - TX341 Nutrition. Foods and food supply (324)
- U Military Science (15)
  - U Military Science (General) (15)
- V Naval Science (240)
  - V Naval Science (General) (23)
  - VM Naval architecture. Shipbuilding. Marine engineering (223)
- Z Bibliography. Library Science. Information Resources (44)
  - Z004 Books. Writing. Paleography (12)
  - Z665 Library Science. Information Science (11)
  - Z719 Libraries (General) (7)
  - ZA Information resources (24)
    - ZA4050 Electronic information resources (13)
    - ZA4450 Databases (2)