Columbia subject headings:
Harvard subject headings:
Catholic Church--Italy--History--20th century.
Catholic Church. Treaties, etc. 1929 February 11.
Church and state--Italy--History--20th century
Mussolini, Benito, 1883-1945
Pius XI, Pope, 1857-1939
Princeton subject headings:
Catholic Church--Italy--History--20th century.
Catholic Church.
Church and state--Italy--History--20th century.
Mussolini, Benito, 1883-1945.
Pius XI, Pope, 1857-1939.