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Library of Congress Subject Areas (8720)
- A General Works (44)
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  - AI Indexes (General) (4)
  - AM Museums (General). Collectors and collecting (General) (8)
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- B Philosophy. Psychology. Religion (499)
  - B Philosophy (General) (92)
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- C Auxiliary Sciences of History (60)
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- D History General and Old World (131)
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- E History America (27)
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- F History United States, Canada, Latin America (78)
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- G Geography. Anthropology. Recreation (662)
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- M Music and Books on Music (220)
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- N Fine Arts (561)
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- Q Science (1715)
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- R Medicine (1292)
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  - RZ Other systems of medicine (103)
- S Agriculture (1039)
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- T Technology (832)
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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 (29)
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  - VM Naval architecture. Shipbuilding. Marine engineering (13)
- Z Bibliography. Library Science. Information Resources (143)
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  - Z665 Library Science. Information Science (42)
  - Z719 Libraries (General) (15)
  - ZA Information resources (113)
    - ZA4050 Electronic information resources (59)
    - ZA4450 Databases (16)