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Library of Congress Subject Areas (28285)
- A General Works (68)
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- B Philosophy. Psychology. Religion (998)
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- C Auxiliary Sciences of History (43)
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- D History General and Old World (313)
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- E History America (3)
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- G Geography. Anthropology. Recreation (1523)
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- J Political Science (2200)
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- L Education (4364)
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- M Music and Books on Music (70)
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- N Fine Arts (95)
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- Q Science (3377)
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- R Medicine (188)
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- S Agriculture (151)
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- T Technology (2260)
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  - TK Electrical engineering. Electronics Nuclear engineering (221)
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  - TR Photography (17)
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- U Military Science (48)
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- V Naval Science (3)
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  - VM Naval architecture. Shipbuilding. Marine engineering (2)
- Z Bibliography. Library Science. Information Resources (145)
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