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Library of Congress Subject Areas (2400)
- A General Works (55)
  - AC Collections. Series. Collected works (15)
  - AI Indexes (General) (9)
  - AS Academies and learned societies (General) (33)
- B Philosophy. Psychology. Religion (15)
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- C Auxiliary Sciences of History (2)
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- G Geography. Anthropology. Recreation (7)
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- H Social Sciences (41)
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- K Law (14)
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- L Education (551)
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- M Music and Books on Music (4)
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- N Fine Arts (2)
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- P Language and Literature (2)
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- Q Science (125)
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- R Medicine (1951)
  - R Medicine (General) (721)
  - RA Public aspects of medicine (124)
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  - RB Pathology (23)
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  - RT Nursing (615)
  - RV Botanic, Thomsonian, and eclectic medicine (16)
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  - RZ Other systems of medicine (242)
- S Agriculture (3)
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- T Technology (94)
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- Z Bibliography. Library Science. Information Resources (52)
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  - ZA Information resources (30)
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