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Library of Congress Subject Areas (27612)
- A General Works (59)
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  - AI Indexes (General) (6)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (45)
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- B Philosophy. Psychology. Religion (958)
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- C Auxiliary Sciences of History (21)
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- D History General and Old World (305)
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- E History America (2)
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- F History United States, Canada, Latin America (3)
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- G Geography. Anthropology. Recreation (1505)
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- H Social Sciences (12304)
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- J Political Science (2139)
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- K Law (1380)
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- L Education (4305)
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  - LD Individual institutions (United States) (1)
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- M Music and Books on Music (70)
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- N Fine Arts (94)
  - N Visual arts (General) For photography, see TR (48)
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- P Language and Literature (674)
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- Q Science (3343)
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- R Medicine (181)
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- S Agriculture (139)
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- T Technology (2124)
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  - TH Building construction (200)
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  - TR Photography (16)
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- U Military Science (45)
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- V Naval Science (2)
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- Z Bibliography. Library Science. Information Resources (134)
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  - ZA Information resources (18)
    - ZA4050 Electronic information resources (13)
    - ZA4450 Databases (4)