Encyclical letter (Divini Redemptoris) of His Holiness Pius XI to his venerable brethren the patriarchs, primates, archbishops, bishops, and other ordinaries in peace and communion with the Apostolic See on atheistic communism.

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• Encyclical letter (Divini Redemptoris ) of His Holiness Pius XI by divine providence Pope...on atheistic communism.
  Wedi'i Greu: (1937)
• Encyclical letter of His Holiness, Pius XI, by Divine Providence Pope to our venerable brethren, the patriarchs, primates, archbishops, bishops and other ordinaries, in peace and communion with the Apostolic See concerning Catholic Action.
  Wedi'i Greu: (1931)
• On Atheistic Communism, Encyclical of His Holiness Pope Pius XI
  gan: Pius, Pope; Catholic Church. Pope (1922-1939 : Pius XI)
  Wedi'i Greu: (1937)
• Encyclical letter of His Holiness Pius XI, by Divine providence, pope to our venerable brethren: the patriarchs, primates, archbishops, bishops and other ordinaries, in peace and communion with the Apostolic See, and to all the faithful of the Catholic world, on reconstructing the social order and perfecting it conformably to the precepts of the Gospel, in commemoration of the fortieth anniversary of the encyclical "Rerum novarum."
  Wedi'i Greu: (1940)
• Encyclical letter of Pope Pius XI on atheistic communism.