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Subject (Genre)
- History159
- Internet videos119
- Sources113
- Congresses104
- Biography76
- Educational films46
- Periodicals40
- Maps27
- Bibliography26
- Texts23
- Chronology21
- Electronic books20
- Early works to 180019
- Fiction12
- Handbooks, manuals, etc10
- Dictionaries9
- Translations into English9
- Conference papers and proceedings8
- Catalogs6
- Documentary television programs6