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Library of Congress Subject Areas (6623)
- A General Works (44)
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  - AS Academies and learned societies (General) (2)
- B Philosophy. Psychology. Religion (993)
  - B Philosophy (General) (14)
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- C Auxiliary Sciences of History (1)
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- G Geography. Anthropology. Recreation (21)
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- H Social Sciences (703)
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- L Education (602)
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  - LC Special aspects of education (112)
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- M Music and Books on Music (17)
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- N Fine Arts (49)
  - N Visual arts (General) For photography, see TR (17)
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- P Language and Literature (8)
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- R Medicine (5814)
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  - RT Nursing (944)
  - RV Botanic, Thomsonian, and eclectic medicine (31)
  - RX Homeopathy (43)
  - RZ Other systems of medicine (351)
- S Agriculture (61)
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- T Technology (9)
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- V Naval Science (1)
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- Z Bibliography. Library Science. Information Resources (35)
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