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- Library of Congress Subject Areas (38828)
- A General Works (1356)
- H Social Sciences (5922)
- J Political Science (738)
- K Law (2690)
- L Education (5310)
- N Fine Arts (191)
- Q Science (6756)
- R Medicine (2236)
- S Agriculture (9540)
- T Technology (4382)
- V Naval Science (1)
Number of items at this level: 0.