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Aeterni Patris
http://www.newadvent.org/cathen/01177a.htmAn encyclical letter of Pope Leo XIII (issued 4 August, 1879); not to be confused with the apostolic letter of the same name written by Pope Pius IX.
Submitted in section: Religion & Spirituality: Christianity: Denominations: Catholicism: Reference: Catholic Encyclopedia: A: Aeterni Patris