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- Library of Congress Subject Areas (34691)
- A General Works (1244)
- H Social Sciences (5348)
- J Political Science (547)
- K Law (2198)
- L Education (4725)
- N Fine Arts (176)
- Q Science (6165)
- R Medicine (2131)
- S Agriculture (8517)
- T Technology (3941)
- V Naval Science (1)
Number of items at this level: 0.