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Subject (Genre)
- Electronic books204
- Periodicals187
- Congresses85
- Case studies80
- Documentary films63
- Nonfiction films40
- Documentary television programs37
- Educational films27
- Internet videos24
- Sources22
- Conference papers and proceedings19
- Legislative hearings19
- Feature films15
- Handbooks, manuals, etc14
- Audiobooks11
- Periodical11
- Interviews10
- History8
- Environmental films7
- Television news programs7