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This file has been used in: Kultursommer 2010 Ruhrgebiet SPD - Exklusiv-Reise (in de) (PDF) 4. SPD-ReiseService (2010-06-18). Retrieved on 2011-07-02.

This file has been used in: Bilder von Essen (in de). essen-lodge.de / Travanto Travel GmbH & Co.KG. Retrieved on 2012-10-19.