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- Library of Congress Subject Areas (24721)
- A General Works (89)
- E History America (264)
- H Social Sciences (5459)
- J Political Science (1471)
- K Law (1071)
- L Education (1527)
- N Fine Arts (394)
- P Language and Literature (1473)
- Q Science (7184)
- R Medicine (3445)
- S Agriculture (110)
- T Technology (1791)
- U Military Science (60)
- V Naval Science (8)
Number of items at this level: 0.