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Subject (Genre)
- Biography88
- Congresses49
- History44
- Sources43
- Legislative hearings18
- Interviews17
- Television news programs16
- Electronic books12
- Periodicals11
- Case studies8
- Online media7
- Documentary films5
- Controversial literature4
- Anecdotes3
- Bibliography3
- Nonfiction films3
- Annotations (Provenance)2
- Archives2
- Biographies2
- Conference papers and proceedings2