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Library of Congress Subject Areas (25273)
- A General Works (28)
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- 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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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (1425)
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- J Political Science (1952)
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- L Education (4108)
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- M Music and Books on Music (66)
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- N Fine Arts (81)
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- Q Science (3059)
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- R Medicine (177)
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- S Agriculture (126)
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- T Technology (1944)
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  - TK Electrical engineering. Electronics Nuclear engineering (215)
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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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