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http://ewtn.com/library/ENCYC/P10IMCON.HTMEncyclical of Pope St. Pius X, issued to mark the fiftieth anniversary of the proclamation of the Immaculate Conception as a dogma. Promulgated 2 February, 1904.
Submitted in section: Denominations: Catholicism: Saints: M: Blessed Virgin Mary: Doctrine: Immaculate Conception: Ad Diem Illum Laetissimum