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- Library of Congress Subject Areas (38995)
- A General Works (1361)
- H Social Sciences (5947)
- J Political Science (756)
- K Law (2699)
- L Education (5360)
- N Fine Arts (191)
- Q Science (6778)
- R Medicine (2238)
- S Agriculture (9600)
- T Technology (4390)
- V Naval Science (1)
Number of items at this level: 0.