Columbia subject headings:
Protestant churches--Germany--Rhineland-Westphalia--History--20th century.
Rhineland-Westphalia (Germany)--Church history--20th century.
Harvard subject headings:
Church and state--Germany--Rhineland--History--20th century.
Church and state--Germany--Ruhr (Region)--History--20th century.
Church and state--Germany--Westphalia--History--20th century.
Germany--Church history--20th century
Protestant churches--Germany--Rhineland--History--20th century.
Protestant churches--Germany--Ruhr (Region)--History--20th century.
Protestant churches--Germany--Westphalia--History--20th century.
Rhineland (Germany)--Church history--20th century.
Ruhr (Germany : Region)--Church history--20th century.
Westphalia (Germany)--Church history--20th century.
Princeton subject headings: