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Subject (Genre)
- Congresses962
- Statistics930
- Periodicals796
- Case studies329
- History161
- Electronic books118
- Sources116
- Documentary films96
- Nonfiction films84
- Biography77
- Interviews64
- Conference papers and proceedings36
- Pictorial works29
- Cross-cultural studies26
- Maps25
- Bibliography24
- Feature films23
- Forecasts23
- Abstracts13
- Short films13