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Subject (Genre)
- Congresses1,557
- Periodicals1,220
- Conference papers and proceedings566
- Electronic books304
- Biography234
- Directories227
- Exhibitions224
- Handbooks, manuals, etc162
- Pictorial works157
- Catalogs137
- Dictionaries127
- History120
- Case studies108
- Statistics108
- Handbooks and manuals55
- Documentary films46
- Internet resources44
- Nonfiction films42
- Periodical42
- Early works to 180040