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- Library of Congress Subject Areas (25027)
- A General Works (92)
- D History (1400)
- E History America (264)
- H Social Sciences (5550)
- J Political Science (1501)
- K Law (1087)
- L Education (1543)
- N Fine Arts (402)
- P Language and Literature (1494)
- Q Science (7299)
- R Medicine (3475)
- S Agriculture (114)
- T Technology (1834)
- U Military Science (61)
- V Naval Science (8)
Number of items at this level: 0.