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Library of Congress Subject Areas (10288)
- A General Works (44)
  - AC Collections. Series. Collected works (31)
  - AI Indexes (General) (4)
  - AM Museums (General). Collectors and collecting (General) (8)
  - AS Academies and learned societies (General) (1)
- B Philosophy. Psychology. Religion (592)
  - B Philosophy (General) (119)
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- C Auxiliary Sciences of History (63)
  - C Auxiliary sciences of history (General) (24)
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    - CD921 Archives (5)
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- D History General and Old World (137)
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- E History America (37)
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- F History United States, Canada, Latin America (89)
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- G Geography. Anthropology. Recreation (775)
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- H Social Sciences (3283)
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- L Education (2664)
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- M Music and Books on Music (273)
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- N Fine Arts (847)
  - N Visual arts (General) For photography, see TR (108)
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- P Language and Literature (509)
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- Q Science (1976)
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- R Medicine (1466)
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  - RZ Other systems of medicine (112)
- S Agriculture (1167)
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  - SH Aquaculture. Fisheries. Angling (78)
- T Technology (1094)
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  - TA Engineering (General). Civil engineering (General) (64)
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  - TK Electrical engineering. Electronics Nuclear engineering (24)
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  - TR Photography (8)
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  - TX Home economics (10)
- U Military Science (8)
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- V Naval Science (38)
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  - VM Naval architecture. Shipbuilding. Marine engineering (18)
- Z Bibliography. Library Science. Information Resources (192)
  - Z004 Books. Writing. Paleography (3)
  - Z665 Library Science. Information Science (47)
  - Z719 Libraries (General) (15)
  - ZA Information resources (159)
    - ZA4050 Electronic information resources (73)
    - ZA4450 Databases (18)