26/7/2024 By ruggles2008 May 15, 1891 Rerum Novarum: On the Condition of Labour Period: May 15, 1891 to Jul 27, 2009 Key Principles of Catholic Social Teaching May 15, 1931 Quadragesimo Anno: On Reconstructing the Social Order May 15, 1961 Mater et Magistra: Mother and Teacher Apr 11, 1962 Pacem in Terris: Peace on Earth Dec 7, 1963 Gaudium et Spes: The Church in the Modern World Mar 26, 1966 Populorum Progressio: On the Development of Peoples May 14, 1971 Octogesima Adveniens: An Apostolic Letter: A Call to Action Dec 8, 1974 Evangeli Nuntiandi: Evangelisation in the Modern World Oct 9, 1981 Laborum Exercems: On Human Work Dec 30, 1987 Sollicitudo Rei Socialis: The Social Concerns of the Church May 15, 1989 Centesimus Annus: One Hundred Years