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Subject (Genre)
- Congresses374
- History83
- Biography71
- Comparative studies70
- Early works to 180069
- Controversial literature64
- Periodicals55
- Criticism, interpretation, etc41
- Sources36
- Conference papers and proceedings28
- Apologetic works26
- Bibliography17
- Commentaries15
- Early works11
- Church history10
- Correspondence10
- Introductions10
- Sermons10
- Interviews7
- Papal documents6