File talk:KölnTriangle (0684).jpg

This file has been used in: Dr. Michael Erb. AOPA-Letter 02/2012 / EASA-FCL Implementierung holpert (in de) (PDF) 7. AOPA-Germany Verband der Allgemeinen Luftfahrt e. V.. Retrieved on 2012-04-11.

This file has been used in: ECA & ETF: Bezpečnost na prvním místě – Ne komereční úvahy (in cs). letecky.biz (2012-05-14). Retrieved on 2012-05-20.

This file has been used in: Kölns Hochhäuser: Die Top 11 (in de). express.de / M. DuMont Schauberg Expedition der Kölnischen Zeitung GmbH & Co. KG (2013-02-27). Retrieved on 2013-02-27. "Thank you" Tweet sent to @express24. Incl. a "Thank you" sent back from @express24

This file has been used in: KlausDiggy (2015-06-01). List of all 100m highrise buildings in Germany (in de). skyscrapercity.com. Retrieved on 2015-06-03. web.archive.org

This file has been used in: KlausDiggy (2014-06-14). Liste der 300 höchsten Hochhäuser in Deutschland (in de). skyscrapercity.com. Retrieved on 2015-07-27. web.archive.org

This file has been used in: Martin Gätke und Elke Landschoof (2018-11-16). Aussichtstürme in NRW Die Welt von oben bewundern (in de). ksta.de / DuMont.next GmbH & Co. KG. Retrieved on 2018-11-18. web.archive.org