Kreisfreistadt Duisburg
Duisburg, a walled town of 5000 residents, had changed little since the great
geographer Gerhard Mercator worked there in the 16th century - until the
early 19th century. Now it is the beginning of the "Ruhrgebiet", an almost
endless stretch of cities, a heavily industrialized area from Duisburg to
Dortmund.
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