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Subject (Genre)
- History146
- Electronic books35
- Broadsides26
- Case studies23
- Tracts (literary works)14
- Interviews11
- Sources10
- Television news programs8
- Congresses7
- Educational films7
- Biography6
- Documentary films6
- Early works to 18006
- Documentary television programs4
- Informational works4
- Nonfiction films4
- Nonfiction television programs4
- Online media4
- Unedited footage4
- Audiobooks3