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Library of Congress Subject Areas (3020)
- 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 (21)
  - B Philosophy (General) (4)
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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 (60)
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- K Law (21)
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- L Education (802)
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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 (3)
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- Q Science (146)
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- R Medicine (2456)
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  - RA Public aspects of medicine (146)
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  - RG Gynecology and obstetrics (315)
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  - RM Therapeutics. Pharmacology (75)
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  - RV Botanic, Thomsonian, and eclectic medicine (17)
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  - RZ Other systems of medicine (255)
- S Agriculture (3)
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- T Technology (140)
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- Z Bibliography. Library Science. Information Resources (77)
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  - Z719 Libraries (General) (27)
  - ZA Information resources (34)
    - ZA4050 Electronic information resources (18)
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