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- Library of Congress Subject Areas (25146)
- A General Works (94)
- D History (1414)
- E History America (265)
- H Social Sciences (5592)
- J Political Science (1510)
- K Law (1091)
- L Education (1549)
- N Fine Arts (406)
- P Language and Literature (1504)
- Q Science (7319)
- R Medicine (3481)
- S Agriculture (113)
- T Technology (1838)
- U Military Science (61)
- V Naval Science (8)
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