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- Biography8,054
- Congresses6,811
- Periodicals2,951
- Fiction2,842
- Exhibitions2,097
- Statistics1,738
- Catalogs1,640
- Dictionaries1,380
- Electronic books1,324
- Sources1,265
- Maps1,180
- Bibliography1,151
- Pictorial works977
- Drama900
- Case studies888
- Handbooks, manuals, etc886
- Interviews782
- Poetry746
- Early works to 1800735
- Guidebooks684