Columbia subject headings:
Harvard subject headings:
Industrialization--Germany--Ruhr (Region)
Regional planning--Germany--Ruhr (Region)
Ruhr (Germany : Region)--Economic conditions
Social change--Germany--Ruhr (Region)
Structural adjustment (Economic policy)--Germany--Ruhr (Region)
Princeton subject headings:
Industrialization--Germany--Ruhr (Region).
Regional planning--Germany--Ruhr (Region)
Ruhr (Germany : Region)--Economic conditions.
Social change--Germany--Ruhr (Region).
Structural adjustment (Economic policy)--Germany--Ruhr (Region).