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Library of Congress Subject Areas (5913)
- A General Works (33)
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- B Philosophy. Psychology. Religion (30)
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- C Auxiliary Sciences of History (6)
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- D History General and Old World (6)
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- G Geography. Anthropology. Recreation (28)
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- L Education (272)
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- P Language and Literature (16)
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- Q Science (1719)
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- S Agriculture (11)
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- T Technology (4111)
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- U Military Science (11)
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- V Naval Science (5)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (20)
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    - ZA4050 Electronic information resources (14)