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Subject (Genre)
- Statistics126
- Congresses103
- Periodicals92
- Popular works70
- Internet videos57
- Handbooks, manuals, etc42
- Educational films39
- Electronic books31
- Early works to 180026
- Periodical24
- Bibliography23
- Case studies23
- Nonfiction films23
- Popular Works23
- Cross-cultural studies20
- Biography19
- Documentary films18
- History18
- Sources18
- Miscellanea10