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- Library of Congress Subject Areas (4962)
- A General Works (9)
- H Social Sciences (1882)
- J Political Science (106)
- K Law (351)
- L Education (264)
- N Fine Arts (93)
- Q Science (474)
- R Medicine (128)
- S Agriculture (542)
- T Technology (1631)
- V Naval Science (20)
Number of items at this level: 0.