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Subject (Genre)
- Nonfiction films109
- Documentary films95
- Feature films30
- Internet videos29
- Instructional films24
- Environmental films18
- Methods (Music)17
- Educational films16
- Biography11
- Documentary television programs11
- Nonfiction television programs10
- Short films9
- Science films7
- Video recordings for the hearing impaired7
- Biographical films6
- Streaming video6
- Nature television programs4
- Webcast4
- Nature films3
- Science television programs3