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Library of Congress Subject Areas (9526)
- 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 (558)
  - B Philosophy (General) (114)
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- C Auxiliary Sciences of History (62)
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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 (32)
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- F History United States, Canada, Latin America (85)
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- G Geography. Anthropology. Recreation (708)
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- H Social Sciences (2994)
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- K Law (561)
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- L Education (2464)
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- M Music and Books on Music (255)
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- N Fine Arts (741)
  - N Visual arts (General) For photography, see TR (99)
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- Q Science (1856)
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- R Medicine (1371)
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  - RZ Other systems of medicine (108)
- S Agriculture (1101)
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- T Technology (925)
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  - TH Building construction (26)
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  - TK Electrical engineering. Electronics Nuclear engineering (23)
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  - TX Home economics (10)
- U Military Science (8)
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- V Naval Science (32)
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  - VM Naval architecture. Shipbuilding. Marine engineering (15)
- Z Bibliography. Library Science. Information Resources (162)
  - Z004 Books. Writing. Paleography (3)
  - Z665 Library Science. Information Science (44)
  - Z719 Libraries (General) (15)
  - ZA Information resources (130)
    - ZA4050 Electronic information resources (60)
    - ZA4450 Databases (16)