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Library of Congress Subject Areas (19246)
- A General Works (115)
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  - AI Indexes (General) (33)
  - AM Museums (General). Collectors and collecting (General) (5)
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- B Philosophy. Psychology. Religion (39)
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- C Auxiliary Sciences of History (4)
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- E History America (4)
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- G Geography. Anthropology. Recreation (19)
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- H Social Sciences (7984)
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- J Political Science (158)
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- L Education (1315)
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- M Music and Books on Music (6)
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- N Fine Arts (5)
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- Q Science (1403)
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- R Medicine (1853)
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- S Agriculture (589)
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- T Technology (3718)
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  - TA Engineering (General). Civil engineering (General) (729)
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  - TK Electrical engineering. Electronics Nuclear engineering (141)
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  - TR Photography (56)
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- U Military Science (3)
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- Z Bibliography. Library Science. Information Resources (70)
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