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Library of Congress Subject Areas (24587)
- A General Works (28)
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  - AM Museums (General). Collectors and collecting (General) (2)
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- B Philosophy. Psychology. Religion (883)
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- C Auxiliary Sciences of History (9)
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- D History General and Old World (288)
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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 (1425)
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- J Political Science (1908)
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- L Education (4041)
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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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- Q Science (3002)
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- R Medicine (174)
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- S Agriculture (124)
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- T Technology (1923)
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  - TH Building construction (192)
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  - TK Electrical engineering. Electronics Nuclear engineering (209)
  - TL Motor vehicles. Aeronautics. Astronautics (17)
  - TP Chemical technology (1)
  - TR Photography (15)
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  - TX Home economics (32)
- U Military Science (42)
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- V Naval Science (2)
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- Z Bibliography. Library Science. Information Resources (127)
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  - ZA Information resources (14)
    - ZA4050 Electronic information resources (9)
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