Ruhrgebiet, 1840, 1930, 1970
By: Arbeitsgemeinschaft Rolf Spörhase, Dietrich und Ingeborg Wulff.
Contributors: Wulff, Dietrich; Wulff, Ingeborg
Publisher: Kohlhammer
Published: 1976
Place of publication: Stuttgart
Language: ger
Subjects: Ruhr River watershed (Germany) -- Historical geography -- Maps
Notes: Titre de la couverture.