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Subject (Genre)
- Statistics105
- Congresses94
- Periodicals90
- Popular works62
- Internet videos56
- Educational films36
- Handbooks, manuals, etc36
- Electronic books26
- Bibliography23
- Early works to 180023
- Nonfiction films22
- Periodical22
- Cross-cultural studies20
- Popular Works20
- Case studies19
- Sources19
- Biography17
- Documentary films16
- History15
- Handbooks9