Title: Rerum novarum
Subjects: Doctrines, Catholic Church. Pope (1878-1903 : Leo XIII), Rerum novarum (Catholic Church. Pope (1878-1903 : Leo XIII)), Church and social problems, Christian sociology, Doctrinal Theology, Catholic Church, Social ethics, Catholic church, doctrines, Church and social problems, catholic church
People: Leo XIII Pope (1810-1903)