Columbia subject headings:
Harvard subject headings:
Catholic Church--Europe, Central--History.
Catholic Church--Europe, Eastern--History.
Catholic Church--Europe, Eastern.
Catholic Church--History--20th century.
Europe, Central--Church history.
Europe, Eastern--Church history.
Princeton subject headings:
Catholic Church--Europe, Central--History.
Catholic Church--Europe, Eastern--History.
Europe, Central--Church history.
Europe, Eastern--Church history.