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Subject (Genre)
- Periodicals314
- Statistics154
- Congresses147
- History141
- Sources77
- Electronic books62
- Case studies38
- Documentary films38
- Biography34
- Documentary television programs26
- Bibliography25
- Maps25
- Interviews22
- Nonfiction television programs21
- Nonfiction films16
- Television news programs16
- Feature films14
- Handbooks, manuals, etc14
- Internet videos14
- Panel discussions11