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Subject (Genre)
- Internet videos233
- Educational films185
- Periodicals95
- Electronic books73
- Documentary films63
- Congresses34
- Nonfiction films34
- Documentary television programs29
- History28
- Nonfiction television programs25
- Case studies24
- Biography21
- Periodical17
- Environmental films13
- Cross-cultural studies10
- Environmental television programs8
- Science television programs8
- Interviews6
- Short films6
- Criticism, interpretation, etc5