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- Library of Congress Subject Areas (23936)
- A General Works (88)
- E History America (263)
- H Social Sciences (5223)
- J Political Science (1404)
- K Law (1030)
- L Education (1486)
- N Fine Arts (380)
- P Language and Literature (1424)
- Q Science (6988)
- R Medicine (3293)
- S Agriculture (106)
- T Technology (1711)
- U Military Science (57)
- V Naval Science (8)
Number of items at this level: 0.