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DuisburgRuhrortHafenmundV. Historische Postkarte von Duisburg aus dem Verlag Hallensleben DuisburgRuhrort Quelle zeno org Zenodot Verlagsgesellschaft mbH Author Author died more than years ago public domain PDold Postcards of Duisburg Uploads by User NatiSythen Bridges in Duisburg DuisburgRuhrort Hafen Iron truss bridges in