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Subject (Genre)
- History80
- Early works to 180066
- Sources48
- Electronic books28
- Biography27
- Congresses21
- Educational films15
- Interviews12
- Unedited footage11
- Biographies8
- Controversial literature8
- Nonfiction television programs8
- Antislavery literature7
- Broadsides7
- Film excerpts7
- Juvenile literature7
- Tracts (literary works)7
- Annual Reports6
- Bibliography6
- Case studies6