Columbia subject headings:
Catholic Church--Europe--History--20th century.
Europe--Civilization--20th century.
Europe--Social life and customs--20th century.
Philosophy, European--20th century.
Politics and culture--Europe--History--20th century.
Protestantism--Europe--20th century.
Harvard subject headings:
Catholic Church--Europe--History--20th century.
Europe--Civilization--20th century.
Europe--Social life and customs--20th century.
Philosophy, European--20th century.
Politics and culture--Europe--History--20th century.
Protestantism--Europe--20th century.
Princeton subject headings:
Catholic Church--Europe--History--20th century.
Europe--Civilization--20th century.
Europe--Social life and customs--20th century.
Philosophy, European--20th century.
Politics and culture--Europe--History--20th century.
Protestantism--Europe--20th century.