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Library of Congress Subject Areas (3319)
- 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)
  - B Philosophy (General) (5)
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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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  - HV Social pathology. Social and public welfare (2)
- K Law (22)
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- L Education (951)
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  - LC Special aspects of education (18)
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- M Music and Books on Music (5)
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- N Fine Arts (2)
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- P Language and Literature (5)
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- Q Science (153)
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- R Medicine (2707)
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  - RS Pharmacy and materia medica (176)
  - RT Nursing (773)
  - RV Botanic, Thomsonian, and eclectic medicine (19)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (263)
- S Agriculture (3)
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- T Technology (144)
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- Z Bibliography. Library Science. Information Resources (88)
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  - ZA Information resources (36)
    - ZA4050 Electronic information resources (19)
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