Columbia subject headings:
Industrial districts--Germany--Ruhr (Region)
Internationale Bauausstellung Emscher Park GmbH.
Urban renewal--Germany--Ruhr (Region)
Harvard subject headings:
Architecture, Modern--20th century--Ems River Region (Germany and Netherlands)
Architecture, Modern--20th century--Germany--Gelsenkirchen
Cluster housing--Ems River Region (Germany and Netherlands)
Cluster housing--Germany--Gelsenkirchen
Internationale Bauaustellung Emscher-Park.
Public housing--Ems River Region (Germany and Netherlands)
Princeton subject headings: