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Ad Diem Illum Laetissimum
http://ewtn.com/library/ENCYC/P10IMCON.HTMOn the Immaculate Conception. Promulgated 2 February, 1904.
Submitted in section: Denominations: Catholicism: Saints: P: Saint Pius X: Works: Encyclicals: Ad Diem Illum Laetissimum