Encyclical Letter of His Holiness by Divine Providence Pope to our Venerable Brethren Patriarchs, Primates, Archbishops, Bishops and Other Local Ordinaries Enjoying Peace and Communion with the Apostolic See: On the Mystical Body of Christ and Our Union in it With Christ, PGEN 133/5975. General Collection, GEN. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/1097642 Accessed November 29, 2024.