0 ENCYCLICAL OF POPE PIUS XII ON THE THREE HUNDRED AND FIFTIETH ANNIVERSARY OF THE REUNION OF THE RUTHENIAN CHURCH WITH THE APOSTOLIC SEE TO THE VENERABLE BRETHREN, THE PATRIARCHS, PRIMATES, ARCHBISHOPS, BISHIOPS, AND OTHER ORDINARIES IN PEACE AND COMMUNION WITH THE APOSTOLIC SEE
Source: Orientales Omnes Ecclesias (Vatican.va)