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Library of Congress Subject Areas (2654)
- A General Works (56)
  - AC Collections. Series. Collected works (15)
  - AI Indexes (General) (10)
  - 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 (42)
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- K Law (16)
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- L Education (583)
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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 (2)
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- Q Science (128)
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- R Medicine (2185)
  - R Medicine (General) (897)
  - RA Public aspects of medicine (135)
    - RA0421 Public health. Hygiene. Preventive Medicine (76)
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  - RG Gynecology and obstetrics (287)
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  - RT Nursing (653)
  - RV Botanic, Thomsonian, and eclectic medicine (16)
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  - RZ Other systems of medicine (247)
- S Agriculture (3)
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- T Technology (100)
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- Z Bibliography. Library Science. Information Resources (54)
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  - ZA Information resources (32)
    - ZA4050 Electronic information resources (17)
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