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Library of Congress Subject Areas (909)
- A General Works (23)
  - AC Collections. Series. Collected works (10)
  - AI Indexes (General) (6)
  - AM Museums (General). Collectors and collecting (General) (3)
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- B Philosophy. Psychology. Religion (2)
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- C Auxiliary Sciences of History (1)
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- E History America (1)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (3)
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- H Social Sciences (418)
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  - HV Social pathology. Social and public welfare (24)
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- J Political Science (23)
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- K Law (63)
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- L Education (196)
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- M Music and Books on Music (1)
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- Q Science (46)
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- R Medicine (2)
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- S Agriculture (126)
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- T Technology (12)
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- V Naval Science (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (2)
- Z Bibliography. Library Science. Information Resources (5)
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  - ZA Information resources (4)
    - ZA4050 Electronic information resources (3)
    - ZA4450 Databases (4)