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Subject (Genre)
- Internet videos233
- Educational films185
- Periodicals97
- Electronic books83
- Documentary films64
- Congresses37
- Documentary television programs35
- Nonfiction films34
- History32
- Nonfiction television programs25
- Case studies24
- Biography21
- Periodical17
- Environmental films14
- Science television programs14
- Criticism, interpretation, etc10
- Cross-cultural studies10
- Environmental television programs8
- Educational television programs6
- Interviews6