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Library of Congress Subject Areas (9721)
- A General Works (45)
  - AC Collections. Series. Collected works (31)
  - AI Indexes (General) (4)
  - AM Museums (General). Collectors and collecting (General) (9)
  - AS Academies and learned societies (General) (1)
- B Philosophy. Psychology. Religion (567)
  - B Philosophy (General) (114)
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- C Auxiliary Sciences of History (62)
  - C Auxiliary sciences of history (General) (23)
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    - CD921 Archives (5)
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- D History General and Old World (136)
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- E History America (35)
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- F History United States, Canada, Latin America (87)
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- G Geography. Anthropology. Recreation (716)
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- H Social Sciences (3058)
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- L Education (2523)
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- M Music and Books on Music (257)
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- N Fine Arts (772)
  - N Visual arts (General) For photography, see TR (102)
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- P Language and Literature (475)
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- Q Science (1889)
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- R Medicine (1406)
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  - RZ Other systems of medicine (109)
- S Agriculture (1111)
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  - SH Aquaculture. Fisheries. Angling (73)
- T Technology (962)
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  - TH Building construction (26)
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  - TK Electrical engineering. Electronics Nuclear engineering (23)
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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 (34)
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  - VM Naval architecture. Shipbuilding. Marine engineering (15)
- Z Bibliography. Library Science. Information Resources (167)
  - Z004 Books. Writing. Paleography (3)
  - Z665 Library Science. Information Science (45)
  - Z719 Libraries (General) (15)
  - ZA Information resources (135)
    - ZA4050 Electronic information resources (61)
    - ZA4450 Databases (16)