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Subject (Genre)
- Charts, diagrams, etc51
- Periodicals38
- Educational films12
- Handbooks, manuals, etc12
- Internet videos12
- Electronic books11
- Case studies10
- Congresses7
- Electronic book5
- Audiobooks4
- Graphs4
- Popular works4
- Problems, exercises, etc4
- Statistics4
- Academic theses3
- bar graphs3
- charts (graphic documents)3
- circular graphs3
- dissertations3
- graphs3