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- Library of Congress Subject Areas (29921)
- A General Works (1058)
- H Social Sciences (4620)
- J Political Science (459)
- K Law (2078)
- L Education (3908)
- N Fine Arts (147)
- Q Science (5112)
- R Medicine (1921)
- S Agriculture (7508)
- T Technology (3441)
- V Naval Science (1)
Number of items at this level: 0.