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Ad Salutem
http://www.papalencyclicals.net/Pius11/P11SALUT.HTM
Encyclical on St. Augustine, promulgated on 30 April, 1930. 78K.
Ingravescentibus Malis
http://www.newadvent.org/docs/pi11im.htm
On the Rosary. Encyclical promulgated 29 September, 1937.
Lux Veritatis
http://www.ewtn.com/library/ENCYC/P11VERIT.HTM
Encyclical on the Council of Ephesus. Promulgated 25 December, 1931.
Rerum Omnium Perturbationem
http://www.papalencyclicals.net/Pius11/P11PERTU.HTM
On St. Francis de Sales. Encyclical promulgated 26 January, 1923.
Rite Expiatis
http://www.papalencyclicals.net/Pius11/P11RITEX.HTM
Encyclical about St. Francis of Assisi, promulgated 13 April, 1926.