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Library of Congress Subject Areas (3125)
- 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 (24)
  - B Philosophy (General) (4)
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- C Auxiliary Sciences of History (2)
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  - CS Genealogy (1)
- G Geography. Anthropology. Recreation (9)
  - G Geography (General) (8)
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- H Social Sciences (63)
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  - HV Social pathology. Social and public welfare (2)
- K Law (21)
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- L Education (856)
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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 (151)
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- R Medicine (2530)
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  - RA Public aspects of medicine (153)
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  - RC Internal medicine (26)
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  - RK Dentistry (311)
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  - RM Therapeutics. Pharmacology (76)
  - RS Pharmacy and materia medica (176)
  - RT Nursing (740)
  - RV Botanic, Thomsonian, and eclectic medicine (19)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (258)
- S Agriculture (3)
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- T Technology (140)
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  - TP Chemical technology (3)
- Z Bibliography. Library Science. Information Resources (84)
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  - Z665 Library Science. Information Science (38)
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  - ZA Information resources (36)
    - ZA4050 Electronic information resources (19)
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