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Subject (Genre)
- Charts, diagrams, etc41
- Periodicals24
- Educational films12
- Internet videos12
- Electronic books10
- Handbooks, manuals, etc6
- Case studies4
- Electronic book4
- Graphs4
- Audiobooks3
- Popular works3
- bar graphs3
- charts (graphic documents)3
- circular graphs3
- graphs3
- line graphs3
- Academic theses2
- Handbooks and manuals2
- History2
- Newspapers2