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Library of Congress Subject Areas (25303)
- A General Works (28)
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  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (17)
- B Philosophy. Psychology. Religion (890)
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- C Auxiliary Sciences of History (9)
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- D History General and Old World (287)
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- E History America (1)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (1436)
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- J Political Science (1952)
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- K Law (1085)
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- L Education (4109)
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- M Music and Books on Music (66)
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- N Fine Arts (81)
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- P Language and Literature (646)
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- Q Science (3069)
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- R Medicine (177)
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- S Agriculture (126)
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- T Technology (1953)
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  - TH Building construction (192)
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  - TK Electrical engineering. Electronics Nuclear engineering (216)
  - TL Motor vehicles. Aeronautics. Astronautics (17)
  - TP Chemical technology (1)
  - TR Photography (16)
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- 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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