Columbia subject headings:
Europe--Church history--20th century.
Europe--Civilization--20th century.
Europe--History--20th century.
Europe--Religion.
Harvard subject headings:
Europe--Church history--20th century.
Europe--Civilization--20th century.
Europe--History--20th century.
Europe--Religion.
Princeton subject headings:
Europe--Church history--20th century.
Europe--Civilization--20th century.
Europe--History--20th century.
Europe--Religion.