Quadragesimo Anno: On the Reconstruction of the Social Order   Pope Pius XI

Mater et Magistra:  Mother and Teacher   Pope John XXIII

Pacem in Terris:  Peace on Earth   Pope John XXIII

Octogesima Adveniens: A Call to Action Issued for the Eightieth Anniversary of Rerum Novarum   Pope Paul VI

Populorum Progressio: On the Development of People    Pope Paul VI

Laborem Exercens: On Human Work   Pope John Paul II

Sollicitudo Rei Socialis: On the Twentieth Anniversary of Populorum Progressio   Pope John Paul II

Centesimus Annus: The Hundredth Anniversary of Rerum Novarum   Pope John Paul II