Leo XIII – Testem Benevolentiae
An Apostolic Letter of Leo XIII to Cardinal Gibbons of Baltimore concerning Americanism
Gregory XVI – Mirari Vos
An encyclical of Gregory XVI concerning Indifferentism and Liberalism
An Apostolic Letter of Leo XIII to Cardinal Gibbons of Baltimore concerning Americanism
An encyclical of Gregory XVI concerning Indifferentism and Liberalism