Columbia subject headings:
Harvard subject headings:
Catholic Church--Germany--Ruhr (Region)--History--Exhibitions.
Cultural pluralism--Germany--Ruhr (Region)--History--Exhibitions.
Freedom of religion--Germany--Ruhr (Region)--History--Exhibitions.
Religious minorities--Germany--Ruhr (Region)--History--Exhibitions.
Religious pluralism--Germany--Ruhr (Region)--History--Exhibitions.
Ruhr (Germany : Region)--Church history--Exhibitions.
Ruhr (Germany : Region)--Emigration and immigration--History--Exhibitions.
Princeton subject headings:
Catholic Church--Germany--Ruhr (Region)--History--Exhibitions.
Cultural pluralism--Germany--Ruhr (Region)--History--Exhibitions.
Freedom of religion--Germany--Ruhr (Region)--History--Exhibitions.
Religious minorities--Germany--Ruhr (Region)--History--Exhibitions.
Religious pluralism--Germany--Ruhr (Region)--History--Exhibitions.
Ruhr (Germany : Region)--Church history--Exhibitions.
Ruhr (Germany : Region)--Emigration and immigration--History--Exhibitions.