Columbia subject headings:
Catholic Church--Germany--Rhine Province--History--20th century.
Catholic Church. Diocese of Aachen (Germany)--History--20th century.
Church and state--Germany--Rhine Province--History--20th century.
Rhine Province (Germany)--Politics and government.
Harvard subject headings:
Catholic Church--Germany--History--1933-1945.
Catholic Church. Diocese of Aachen (Germany)--History.
Church and state--Germany--Aachen--History.
Church and state--Germany--History--1933-1945
Church and state--Germany--Rhine Province--History--20th century.
Foreign workers--Germany--History.
Rhine Province (Germany)--History--20th century.
Princeton subject headings: