Columbia subject headings:
Catholic Church--Europe--History--19th century.
Catholic Church--Europe--History--20th century.
Christianity and politics--Catholic Church--History--19th century.
Christianity and politics--History--20th century.
Church and state--Europe--History--19th century.
Church and state--Europe--History--20th century.
Harvard subject headings:
Catholic Church--Europe--History--19th century.
Catholic Church--Europe--History--20th century.
Christianity and politics--History--19th century.
Christianity and politics--History--20th century
Church and state--Europe--History--19th century.
Church and state--Europe--History--20th century.
Princeton subject headings:
Catholic Church--History--19th century.
Catholic Church--History--20th century.
Catholic Church--Political activity--History.