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Library of Congress Subject Areas (17499)
- A General Works (10)
  - AC Collections. Series. Collected works (2)
  - AI Indexes (General) (3)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (2)
- B Philosophy. Psychology. Religion (2127)
  - B Philosophy (General) (361)
  - BC Logic (1)
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  - BF Psychology (1698)
  - BH Aesthetics (14)
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  - BT Doctrinal Theology (2)
  - BV Practical Theology (2)
  - BX Christian Denominations (1)
- C Auxiliary Sciences of History (49)
  - C Auxiliary sciences of history (General) (2)
  - CC Archaeology (9)
  - CD Diplomatics. Archives. Seals (30)
    - CD921 Archives (30)
  - CS Genealogy (1)
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- D History General and Old World (625)
  - D History (General) (452)
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    - D839 Post-war History, 1945 on (31)
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  - DA Great Britain (185)
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  - DE The Mediterranean Region. The Greco-Roman World (1)
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- E History America (69)
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- F History United States, Canada, Latin America (65)
  - F001 United States local history (10)
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- G Geography. Anthropology. Recreation (442)
  - G Geography (General) (24)
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  - GC Oceanography (97)
  - GE Environmental Sciences (241)
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  - GV Recreation Leisure (74)
    - GV557 Sport (21)
- H Social Sciences (6268)
  - H Social Sciences (General) (1849)
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  - HC Economic History and Conditions (38)
  - HD Industries. Land use. Labor (680)
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  - HT Communities. Classes. Races (98)
  - HV Social pathology. Social and public welfare (51)
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- J Political Science (1649)
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  - JA Political science (General) (964)
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  - JV Colonies and colonization. Emigration and immigration. International migration (112)
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- K Law (1119)
  - K Law (General) (1022)
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- L Education (310)
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- M Music and Books on Music (24)
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- N Fine Arts (230)
  - N Visual arts (General) For photography, see TR (69)
  - NA Architecture (26)
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  - NX Arts in general (111)
- P Language and Literature (1425)
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  - PL Languages and literatures of Eastern Asia, Africa, Oceania (12)
  - PN Literature (General) (389)
    - PN0080 Criticism (53)
    - PN0441 Literary History (24)
    - PN1990 Broadcasting (38)
    - PN1993 Motion Pictures (74)
    - PN2000 Dramatic representation. The Theater (75)
  - PQ Romance literatures (3)
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- Q Science (4294)
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  - QH Natural history (1183)
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- R Medicine (1536)
  - R Medicine (General) (492)
  - RA Public aspects of medicine (235)
    - RA0421 Public health. Hygiene. Preventive Medicine (103)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (8)
    - RA790 Mental Health (109)
  - RB Pathology (9)
  - RC Internal medicine (647)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (134)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (212)
    - RC0500 Psychoanalysis (134)
    - RC1200 Sports Medicine (163)
  - RD Surgery (4)
  - RE Ophthalmology (69)
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  - RG Gynecology and obstetrics (21)
  - RJ Pediatrics (38)
    - RJ101 Child Health. Child health services (32)
  - RK Dentistry (4)
  - RL Dermatology (3)
  - RM Therapeutics. Pharmacology (23)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (44)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (10)
- S Agriculture (78)
  - S Agriculture (General) (53)
  - SB Plant culture (6)
  - SD Forestry (3)
  - SF Animal culture (4)
  - SH Aquaculture. Fisheries. Angling (15)
- T Technology (348)
  - T Technology (General) (67)
  - TA Engineering (General). Civil engineering (General) (5)
  - TD Environmental technology. Sanitary engineering (3)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (244)
  - TL Motor vehicles. Aeronautics. Astronautics (9)
  - TR Photography (25)
  - TS Manufactures (1)
- U Military Science (28)
  - U Military Science (General) (28)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (117)
  - Z004 Books. Writing. Paleography (19)
  - Z665 Library Science. Information Science (8)
  - Z719 Libraries (General) (3)
  - ZA Information resources (90)
    - ZA4050 Electronic information resources (80)
    - ZA4450 Databases (6)