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Library of Congress Subject Areas (23589)
- 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 (865)
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- C Auxiliary Sciences of History (9)
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- D History General and Old World (286)
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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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- J Political Science (1867)
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- L Education (3934)
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- M Music and Books on Music (65)
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- N Fine Arts (81)
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- Q Science (2805)
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- R Medicine (167)
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- S Agriculture (124)
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- T Technology (1923)
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  - TK Electrical engineering. Electronics Nuclear engineering (209)
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  - 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 (126)
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    - ZA4050 Electronic information resources (9)
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