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Library of Congress Subject Areas (28785)
- A General Works (83)
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- B Philosophy. Psychology. Religion (1098)
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- C Auxiliary Sciences of History (57)
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- D History General and Old World (328)
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- E History America (4)
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- G Geography. Anthropology. Recreation (1530)
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- J Political Science (2249)
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- L Education (4428)
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- M Music and Books on Music (71)
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- N Fine Arts (98)
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- Q Science (3396)
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- R Medicine (192)
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- S Agriculture (155)
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- T Technology (2289)
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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 (49)
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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 (153)
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  - ZA Information resources (37)
    - ZA4050 Electronic information resources (31)
    - ZA4450 Databases (5)