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- Library of Congress Subject Areas (39004)
- A General Works (1361)
- H Social Sciences (5947)
- J Political Science (756)
- K Law (2699)
- L Education (5364)
- N Fine Arts (192)
- Q Science (6778)
- R Medicine (2238)
- S Agriculture (9608)
- T Technology (4388)
- V Naval Science (1)
Number of items at this level: 0.