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Library of Congress Subject Areas (17225)
- A General Works (9)
  - 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 (2)
- B Philosophy. Psychology. Religion (2058)
  - B Philosophy (General) (352)
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- C Auxiliary Sciences of History (50)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (1)
  - CC Archaeology (9)
  - CD Diplomatics. Archives. Seals (30)
    - CD921 Archives (30)
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- D History General and Old World (616)
  - D History (General) (448)
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- E History America (67)
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- F History United States, Canada, Latin America (61)
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- G Geography. Anthropology. Recreation (436)
  - G Geography (General) (24)
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- H Social Sciences (6178)
  - H Social Sciences (General) (1808)
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- J Political Science (1623)
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- K Law (1090)
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- L Education (295)
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- M Music and Books on Music (24)
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- N Fine Arts (221)
  - N Visual arts (General) For photography, see TR (66)
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- P Language and Literature (1411)
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  - PN Literature (General) (385)
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- Q Science (4239)
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- R Medicine (1522)
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  - RA Public aspects of medicine (232)
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  - RB Pathology (8)
  - RC Internal medicine (643)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (132)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (212)
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  - RM Therapeutics. Pharmacology (21)
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  - RT Nursing (42)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (8)
- S Agriculture (77)
  - S Agriculture (General) (53)
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  - SD Forestry (3)
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  - SH Aquaculture. Fisheries. Angling (15)
- T Technology (340)
  - T Technology (General) (63)
  - TA Engineering (General). Civil engineering (General) (5)
  - TD Environmental technology. Sanitary engineering (3)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
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  - TK Electrical engineering. Electronics Nuclear engineering (240)
  - TL Motor vehicles. Aeronautics. Astronautics (9)
  - TR Photography (24)
  - TS Manufactures (1)
- U Military Science (25)
  - U Military Science (General) (25)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (115)
  - Z004 Books. Writing. Paleography (19)
  - Z665 Library Science. Information Science (7)
  - Z719 Libraries (General) (2)
  - ZA Information resources (90)
    - ZA4050 Electronic information resources (80)
    - ZA4450 Databases (6)