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Library of Congress Subject Areas (4754)
- A General Works (38)
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  - AI Indexes (General) (3)
  - AM Museums (General). Collectors and collecting (General) (2)
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- B Philosophy. Psychology. Religion (317)
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- C Auxiliary Sciences of History (20)
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    - CD921 Archives (3)
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- D History General and Old World (37)
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- E History America (17)
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- F History United States, Canada, Latin America (69)
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- G Geography. Anthropology. Recreation (288)
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- H Social Sciences (1213)
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- J Political Science (253)
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- L Education (1291)
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- M Music and Books on Music (97)
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- N Fine Arts (166)
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- Q Science (935)
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- R Medicine (878)
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  - RV Botanic, Thomsonian, and eclectic medicine (4)
  - RX Homeopathy (1)
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- S Agriculture (362)
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- T Technology (288)
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  - TP Chemical technology (20)
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- U Military Science (4)
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- V Naval Science (23)
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  - VM Naval architecture. Shipbuilding. Marine engineering (9)
- Z Bibliography. Library Science. Information Resources (68)
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  - Z665 Library Science. Information Science (24)
  - Z719 Libraries (General) (8)
  - ZA Information resources (50)
    - ZA4050 Electronic information resources (34)
    - ZA4450 Databases (10)