Genres
- Christian sociology
- Catholic authors
- Catholic Church
- World War, 1914-1918
- Papal Letters
- Church and labor
- Church and state
- Marriage
- Catholic Church. Pope, 1903-1914 (Pius X)
- Catholic Church. Pope (1922-1939 : Pius XI)
- Sociology,Christian
- Catholic Church. Pope (1878-1903 : Leo XIII)
- Catholic Church. Pope, 1914-1922 (Benedictus XV)
- Papal Encyclicals
- Labor
- Christianity
- War work
- Churches
- Catholic Church. Pope (1903-1914 : Pius X)
- Catholic Church. Pope (1914-1922 : Benedict XV)
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