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Quelle: Karte 1: http://commons.wikimedia.org/wiki/Image:Ruhr_area-map.png http://en.wikipedia.org/wiki/GNU_Free_Documentation_License Karte 2: http://upload.wikimedia.org/wikipedia/commons/a/a3/Rheinruhr.png http://en.wikipedia.org/wiki/GNU_Free_Documentation_License |