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Library of Congress Subject Areas (3138)
- B Philosophy. Psychology. Religion (28)
  - B Philosophy (General) (5)
  - BC Logic (2)
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- D History General and Old World (14)
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- G Geography. Anthropology. Recreation (25)
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- H Social Sciences (607)
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  - HV Social pathology. Social and public welfare (4)
- J Political Science (92)
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- L Education (199)
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- M Music and Books on Music (1)
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- N Fine Arts (33)
  - N Visual arts (General) For photography, see TR (5)
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- Q Science (1279)
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- R Medicine (517)
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  - RA Public aspects of medicine (53)
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  - RC Internal medicine (62)
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  - RM Therapeutics. Pharmacology (111)
  - RS Pharmacy and materia medica (46)
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  - RV Botanic, Thomsonian, and eclectic medicine (7)
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  - RZ Other systems of medicine (26)
- S Agriculture (32)
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- T Technology (899)
  - T Technology (General) (451)
  - TA Engineering (General). Civil engineering (General) (291)
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  - TK Electrical engineering. Electronics Nuclear engineering (57)
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  - TP Chemical technology (151)
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- U Military Science (5)
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- V Naval Science (3)
  - V Naval Science (General) (3)
- Z Bibliography. Library Science. Information Resources (39)
  - Z004 Books. Writing. Paleography (5)
  - Z665 Library Science. Information Science (3)
  - Z719 Libraries (General) (3)
  - ZA Information resources (29)
    - ZA4050 Electronic information resources (20)
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