Encyclicals of Pius XI Vol 1 Atheistic Communism - Divini Redemptoris 1937|Concerning Catholic action - Non abbiamo bisogno 1931|Catholic priesthood - Ad Catholici sacerdotii 1935|Catholicism in Mexico - Firmissimam Constantiam 1937|Christian Education of youth - Rappresentanti in te - Pius XI (London Catholic Truth Society, various dates ., 1925)