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Library of Congress Subject Areas (3299)
- A General Works (57)
  - AC Collections. Series. Collected works (16)
  - AI Indexes (General) (10)
  - AS Academies and learned societies (General) (33)
- B Philosophy. Psychology. Religion (25)
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- C Auxiliary Sciences of History (2)
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- G Geography. Anthropology. Recreation (9)
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- H Social Sciences (64)
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- K Law (22)
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- L Education (937)
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- M Music and Books on Music (5)
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- P Language and Literature (5)
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- R Medicine (2688)
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  - RV Botanic, Thomsonian, and eclectic medicine (19)
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  - RZ Other systems of medicine (262)
- S Agriculture (3)
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- T Technology (143)
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- Z Bibliography. Library Science. Information Resources (87)
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