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Subject (Genre)
- Handbooks and manuals189
- Handbooks, manuals, etc167
- Congresses148
- Conference papers and proceedings145
- Electronic books131
- History98
- Documentary films66
- Academic theses58
- dissertations56
- handbooks56
- Internet videos54
- Periodicals48
- Nonfiction films47
- Documentary television programs45
- Audiobooks43
- Case studies41
- Drama38
- Records (Documents)35
- Instructional films33
- Biography32