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Subject (Genre)
- Statistics73
- Case studies54
- Congresses35
- History25
- Handbooks, manuals, etc23
- Periodicals20
- Cross-cultural studies19
- Electronic books15
- Biography9
- Documentary films7
- Longitudinal studies7
- Nonfiction films6
- Dictionaries4
- Pictorial works4
- Platforms4
- Rules and practice4
- Sources4
- Comic books, strips, etc3
- Data sets3
- Databases3