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This file has been used in: Quintin Goynes. The Most Beautiful Churches And Cathedrals In Cologne (in en). theculturetrip.com. Retrieved on 2015-11-05.

This file has been used in: Jeannette Butler (2020-02). As Mais Belas Igrejas E Catedrais De Colônia (in pt). pt.yourtripagent.com. Retrieved on 2020-03-09. Name ok, no license, "WikiCommons"