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Subject (Genre)
- Sources319
- History314
- Biography296
- Congresses206
- Early works to 180068
- Controversial literature55
- Correspondence51
- Bibliography41
- Church history38
- Interviews38
- Periodicals38
- Conference papers and proceedings24
- Electronic books23
- Biographies21
- Catalogs21
- Papal documents18
- Pictorial works13
- Diaries11
- Apologetic works9
- Archives9