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Subject (Genre)
- Educational films166
- Internet videos138
- Periodicals108
- Congresses76
- Film clips51
- Electronic books22
- Statistics17
- Problems, exercises, etc15
- Case studies12
- Conference papers and proceedings7
- Handbooks, manuals, etc6
- Popular works5
- Encyclopedias4
- Textbooks4
- Academic theses3
- Bibliography3
- Handbooks and manuals3
- History3
- Interviews3
- Biography2