Columbia subject headings:
Community development--Germany--Ruhr (Region)
Higher education and state--Germany--Ruhr (Region)
Local transit--Germany--Ruhr (Region)
Regional planning--Germany--Ruhr (Region)
Research and development projects--Germany--Ruhr (Region)
Ruhr (Germany : Region)--Cultural policy.
Ruhr (Germany : Region)--Relations.
Science--Germany--Ruhr (Region)--Planning.
Harvard subject headings:
Community development--Germany--Ruhr (Region)
Higher education and state--Germany--Ruhr (Region)
Local transit--Germany--Ruhr (Region)
Regional planning--Germany--Ruhr (Region)
Ruhr (Germany : Region)--Cultural policy.
Ruhr (Germany : Region)--Relations.
Princeton subject headings: