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Subject (Genre)
- Sources548
- Early works to 1800242
- Congresses182
- Biography179
- History120
- Catalogs118
- Bibliography90
- Church history60
- Exhibitions49
- Controversial literature43
- Guidebooks43
- Legislative Report - Private Bills39
- Archives35
- Pictorial works34
- Correspondence33
- Periodicals33
- Annotations (Provenance)24
- Directories24
- Electronic books21
- Papal documents19