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Subject (Genre)
- History91
- Congresses34
- Sources26
- Early works to 180021
- Criticism, interpretation, etc17
- Apologetic works13
- Biography12
- Translations into English9
- Bibliography8
- Conference papers and proceedings6
- Electronic books6
- Controversial literature5
- Chronology4
- Texts4
- Works to 19004
- Encyclopedias3
- Fiction3
- Papal documents3
- Biographies2
- Book reviews2