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Subject (Genre)
- Periodicals176
- Documentary films144
- Congresses85
- History81
- Internet videos49
- Conference papers and proceedings32
- Criticism, interpretation, etc25
- Nonfiction films24
- Early works to 180023
- Electronic books23
- Television news programs22
- Atlases18
- Handbooks, manuals, etc17
- Handbooks and manuals16
- Documentary television programs14
- Case studies13
- Atlas11
- Feature films11
- Periodical11
- handbooks11