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Library of Congress Subject Areas (9061)
- 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 (522)
  - B Philosophy (General) (94)
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- C Auxiliary Sciences of History (61)
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- D History General and Old World (133)
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- E History America (29)
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- F History United States, Canada, Latin America (83)
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- G Geography. Anthropology. Recreation (683)
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- L Education (2346)
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- M Music and Books on Music (239)
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- N Fine Arts (664)
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- Q Science (1767)
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- R Medicine (1329)
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- S Agriculture (1060)
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- T Technology (860)
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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 (149)
  - Z004 Books. Writing. Paleography (3)
  - Z665 Library Science. Information Science (43)
  - Z719 Libraries (General) (15)
  - ZA Information resources (118)
    - ZA4050 Electronic information resources (60)
    - ZA4450 Databases (16)