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Subject (Genre)
- Periodicals209
- Congresses137
- History97
- Statistics80
- Sources54
- Electronic books50
- Biography26
- Documentary films22
- Case studies21
- Nonfiction television programs21
- Bibliography20
- Documentary television programs20
- Maps18
- Television news programs16
- Internet videos14
- Interviews14
- Panel discussions11
- Handbooks, manuals, etc8
- Educational films7
- Feature films7