Supremi Apostolatus Officio

Supremi Apostolatus Officio is an encyclical on the Rosary by Pope Leo XIII, also known as the Rosary Pope.
It was issued on September 1st, 1883 in Saint Peter's Basilica in Rome.
==Sources==
* Vatican website: Supremi Apostolatus Officio 
Category:Documents of the Catholic Church
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