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Subject (Genre)
- Congresses10,194
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- Electronic books4,034
- Case studies3,515
- Biography3,103
- History2,653
- Sources2,314
- Statistics1,442
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- Dictionaries1,163
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- Early works to 18001,102
- Registers700
- Nonfiction films670
- Interviews633
- Streaming videos556
- Speeches544
- Cross-cultural studies512
- Platforms511
- Messages472