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Library of Congress Subject Areas (23319)
- A General Works (28)
  - AC Collections. Series. Collected works (5)
  - AI Indexes (General) (5)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (17)
- B Philosophy. Psychology. Religion (861)
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- C Auxiliary Sciences of History (9)
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- D History General and Old World (283)
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- E History America (1)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (1393)
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- H Social Sciences (10191)
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- J Political Science (1848)
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- K Law (917)
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- L Education (3917)
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  - LD Individual institutions (United States) (1)
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- M Music and Books on Music (65)
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- N Fine Arts (81)
  - N Visual arts (General) For photography, see TR (42)
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- P Language and Literature (611)
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- Q Science (2723)
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    - QA76 Computer software (950)
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- R Medicine (167)
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  - RA Public aspects of medicine (98)
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- S Agriculture (124)
  - S Agriculture (General) (78)
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  - SH Aquaculture. Fisheries. Angling (23)
- T Technology (1913)
  - T Technology (General) (927)
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  - TA Engineering (General). Civil engineering (General) (22)
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  - TH Building construction (192)
  - TJ Mechanical engineering and machinery (25)
  - TK Electrical engineering. Electronics Nuclear engineering (209)
  - TL Motor vehicles. Aeronautics. Astronautics (17)
  - TP Chemical technology (1)
  - TR Photography (15)
  - TS Manufactures (417)
  - TT Handicrafts Arts and crafts (1)
  - TX Home economics (32)
- U Military Science (42)
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- V Naval Science (2)
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  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (126)
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  - Z719 Libraries (General) (41)
  - ZA Information resources (14)
    - ZA4050 Electronic information resources (9)
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