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Library of Congress Subject Areas (13838)
- A General Works (8)
  - AC Collections. Series. Collected works (1)
  - 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 (1)
- B Philosophy. Psychology. Religion (1624)
  - B Philosophy (General) (256)
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- C Auxiliary Sciences of History (30)
  - C Auxiliary sciences of history (General) (1)
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- D History General and Old World (506)
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- E History America (61)
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- F History United States, Canada, Latin America (54)
  - F001 United States local history (8)
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- G Geography. Anthropology. Recreation (307)
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- H Social Sciences (5072)
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- J Political Science (1355)
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  - JV Colonies and colonization. Emigration and immigration. International migration (82)
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- K Law (851)
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- L Education (186)
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- M Music and Books on Music (21)
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- N Fine Arts (162)
  - N Visual arts (General) For photography, see TR (47)
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- P Language and Literature (1182)
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  - PQ Romance literatures (3)
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- Q Science (3357)
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- R Medicine (1076)
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    - RA790 Mental Health (34)
  - RB Pathology (8)
  - RC Internal medicine (450)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (74)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (143)
    - RC0500 Psychoanalysis (108)
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  - RT Nursing (31)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (4)
- S Agriculture (53)
  - S Agriculture (General) (34)
  - SB Plant culture (5)
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  - SH Aquaculture. Fisheries. Angling (13)
- T Technology (296)
  - T Technology (General) (49)
  - TA Engineering (General). Civil engineering (General) (2)
  - TD Environmental technology. Sanitary engineering (1)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (222)
  - TL Motor vehicles. Aeronautics. Astronautics (3)
  - TR Photography (18)
- U Military Science (23)
  - U Military Science (General) (23)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (65)
  - Z004 Books. Writing. Paleography (17)
  - Z665 Library Science. Information Science (5)
  - Z719 Libraries (General) (2)
  - ZA Information resources (44)
    - ZA4050 Electronic information resources (37)
    - ZA4450 Databases (4)