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- Electronic books5,233
- Periodicals4,594
- Congresses4,141
- Biography3,588
- Case studies2,943
- Statistics2,039
- Handbooks, manuals, etc1,469
- History1,366
- Directories1,180
- Cross-cultural studies1,060
- Curricula1,025
- Sources912
- Bibliography507
- Pictorial works340
- Dictionaries299
- Catalogs284
- Registers248
- Interviews234
- Early works to 1800221
- Tracts (literary genre)208