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Subject (Genre)
- Electronic books205
- Periodicals187
- Congresses85
- Case studies80
- Documentary films62
- Nonfiction films40
- Documentary television programs37
- Educational films27
- Internet videos24
- Sources22
- Legislative hearings20
- Conference papers and proceedings19
- Feature films14
- Handbooks, manuals, etc14
- Periodical11
- Audiobooks10
- Interviews10
- History8
- Environmental films7
- Television news programs7