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Library of Congress Subject Areas (17162)
- A General Works (9)
  - AC Collections. Series. Collected works (1)
  - AI Indexes (General) (3)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (2)
- B Philosophy. Psychology. Religion (2049)
  - B Philosophy (General) (351)
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- C Auxiliary Sciences of History (50)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (1)
  - CC Archaeology (9)
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- D History General and Old World (614)
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- E History America (67)
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- F History United States, Canada, Latin America (61)
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- G Geography. Anthropology. Recreation (434)
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- H Social Sciences (6159)
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- J Political Science (1616)
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- K Law (1088)
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- L Education (289)
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- M Music and Books on Music (24)
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- N Fine Arts (220)
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- P Language and Literature (1405)
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- Q Science (4220)
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- R Medicine (1521)
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  - RB Pathology (8)
  - RC Internal medicine (642)
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    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (212)
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  - RM Therapeutics. Pharmacology (21)
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  - RZ Other systems of medicine (8)
- S Agriculture (76)
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  - SH Aquaculture. Fisheries. Angling (15)
- T Technology (339)
  - T Technology (General) (62)
  - TA Engineering (General). Civil engineering (General) (5)
  - TD Environmental technology. Sanitary engineering (3)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
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  - TK Electrical engineering. Electronics Nuclear engineering (240)
  - TL Motor vehicles. Aeronautics. Astronautics (9)
  - TR Photography (24)
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- U Military Science (24)
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- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (115)
  - Z004 Books. Writing. Paleography (19)
  - Z665 Library Science. Information Science (7)
  - Z719 Libraries (General) (2)
  - ZA Information resources (90)
    - ZA4050 Electronic information resources (80)
    - ZA4450 Databases (6)