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Library of Congress Subject Areas (5829)
- A General Works (40)
  - AC Collections. Series. Collected works (33)
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  - AM Museums (General). Collectors and collecting (General) (3)
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- B Philosophy. Psychology. Religion (377)
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- C Auxiliary Sciences of History (36)
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- D History General and Old World (55)
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- E History America (21)
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- F History United States, Canada, Latin America (73)
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- G Geography. Anthropology. Recreation (373)
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- H Social Sciences (1602)
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- L Education (1660)
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- M Music and Books on Music (151)
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- N Fine Arts (242)
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- Q Science (1208)
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- R Medicine (1020)
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- S Agriculture (507)
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- T Technology (437)
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  - TR Photography (3)
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  - TX Home economics (9)
- U Military Science (5)
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- V Naval Science (28)
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  - VM Naval architecture. Shipbuilding. Marine engineering (12)
- Z Bibliography. Library Science. Information Resources (116)
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  - Z665 Library Science. Information Science (29)
  - Z719 Libraries (General) (10)
  - ZA Information resources (95)
    - ZA4050 Electronic information resources (54)
    - ZA4450 Databases (12)