Columbia subject headings:
Church and state--Germany--Ruhr (Region)
Community organization--Germany--Ruhr (Region)
Political parties--Germany--Ruhr (Region)
Ruhr (Germany : Region)--Politics and government.
Harvard subject headings:
Church and state--Germany--Ruhr (Region)
Community organization--Germany--Ruhr (Region)
Political parties--Germany--Ruhr (Region)
Ruhr (Germany : Region)--Politics and government.
Princeton subject headings:
Political parties--Germany (West)