Encyclical letter of his holiness Pius XII by divine providence Pope to His Venerable Brethren the Patriarchs, Primates, Archbishops, Bishops and other Ordinaries at peace and in communion with the Apostolic See on mystical body of Jesus Christ and our union with christ therein / Pius XII. ; translated by G.D. Smith.    London :  Catholic truth society,  [1955?] . 68 s.