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Library of Congress Subject Areas (14530)
- A General Works (8)
  - AC Collections. Series. Collected works (1)
  - AI Indexes (General) (3)
  - AM Museums (General). Collectors and collecting (General) (3)
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  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (1713)
  - B Philosophy (General) (285)
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- C Auxiliary Sciences of History (31)
  - C Auxiliary sciences of history (General) (2)
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- D History General and Old World (528)
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- E History America (62)
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- F History United States, Canada, Latin America (55)
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- G Geography. Anthropology. Recreation (321)
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- H Social Sciences (5282)
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- J Political Science (1419)
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- K Law (917)
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- L Education (218)
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- M Music and Books on Music (22)
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- N Fine Arts (168)
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- P Language and Literature (1217)
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- Q Science (3549)
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- R Medicine (1173)
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  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (1)
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- S Agriculture (53)
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  - SH Aquaculture. Fisheries. Angling (13)
- T Technology (307)
  - T Technology (General) (51)
  - TA Engineering (General). Civil engineering (General) (2)
  - TD Environmental technology. Sanitary engineering (1)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (229)
  - TL Motor vehicles. Aeronautics. Astronautics (5)
  - TR Photography (19)
- U Military Science (24)
  - U Military Science (General) (24)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (67)
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  - Z665 Library Science. Information Science (6)
  - Z719 Libraries (General) (2)
  - ZA Information resources (45)
    - ZA4050 Electronic information resources (38)
    - ZA4450 Databases (4)