Columbia subject headings:
Catholic Church--Europe--History--20th century.
Catholics--Europe--Societies, etc.--History--20th century.
Catholics--Political activity--Europe--History--20th century.
Christianity and politics--Catholic Church--History--20th century.
Europe--Politics and government--1918-1945.
Harvard subject headings:
Catholic Church--Europe--History--20th century.
Catholics--Europe--Political activity--History--20th century.
Catholics--Europe--Societies, etc.--History--20th century.
Christianity and politics--Catholic Church--History--20th century
Europe--Politics and government--1918-1945.
Princeton subject headings:
Catholic Church--Europe--History--20th century.
Catholics--Europe--Political activity--History--20th century.
Catholics--Europe--Societies, etc.--History--20th century.
Christianity and politics--Catholic Church--History--20th century.
Europe--Politics and government--1918-1945.