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Subject (Genre)
- Congresses2,241
- Periodicals1,163
- Internet videos649
- Educational films432
- Documentary films367
- Bibliography293
- Case studies282
- Electronic books271
- Maps235
- Documentary television programs219
- History199
- Biography181
- Pictorial works165
- Academic theses152
- Handbooks, manuals, etc146
- Nonfiction films146
- Classification123
- Dictionaries110
- Nature television programs102
- Periodical102