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Subject (Genre)
- History212
- Biography118
- Interviews87
- Sources87
- Unedited footage81
- Biographies46
- Educational films32
- Nonfiction television programs24
- Electronic books17
- Film excerpts16
- Controversial literature14
- interviews14
- Documentary television programs13
- Campaign literature10
- Congresses10
- Documentary films10
- Slave narratives10
- Encyclopedias9
- Film clips9
- Correspondence8