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Library of Congress Subject Areas (43285)
- A General Works (51)
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- B Philosophy. Psychology. Religion (3102)
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- C Auxiliary Sciences of History (8)
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- D History General and Old World (6)
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- G Geography. Anthropology. Recreation (656)
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- H Social Sciences (8088)
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- L Education (14686)
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- M Music and Books on Music (16)
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- N Fine Arts (348)
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- Q Science (2380)
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- R Medicine (7159)
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- S Agriculture (57)
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- T Technology (3418)
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  - TK Electrical engineering. Electronics Nuclear engineering (470)
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- U Military Science (1)
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- V Naval Science (15)
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  - VM Naval architecture. Shipbuilding. Marine engineering (3)
- X General Subject (220)
- Z Bibliography. Library Science. Information Resources (39)
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    - ZA4050 Electronic information resources (9)
    - ZA4450 Databases (4)