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Subject (Genre)
- Congresses20
- Internet videos20
- Educational films17
- Periodicals17
- Electronic books16
- History14
- Case studies8
- Biography6
- Documentary films6
- Documentary television programs4
- Exhibitions4
- Historical television programs4
- Popular works4
- Television mini-series4
- Annotations (Provenance)3
- Bibliography3
- Encyclopedias3
- Pictorial works3
- Statistics3
- Criticism, interpretation, etc2