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Subject (Genre)
- History43
- Biography32
- Sources25
- Documentary television programs19
- Electronic books12
- Records and correspondence12
- Biographies11
- Data sets11
- Text corpora11
- Documentary films10
- Databases7
- Archives6
- Interviews6
- Nonfiction films6
- Feature films5
- Pictorial works5
- Case studies4
- Trials, litigation, etc4
- Educational films3
- Internet videos3