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EMAG I'm GAME Cologne (in de) (PDF) 40. Mensa in Deutschland e. V. (2008-07-30). Retrieved on 2010-12-26. |
This file has been used in:
Cologne Cathedral (Part Four) (in en). zephyrinus-zephyrinus.blogspot.de / Zephyrinus (2012-11-21). Retrieved on 2012-11-24. |
This file has been used in:
Gotisches Meisterwerk aus sechs Jahrhunderten (in de). unesco.de / Deutsche UNESCO-Kommission e.V.. Retrieved on 2018-05-22. |