Please specify if terms of license are complied with! (2010-08-11). "Geocaching Landkarte". Querfeldeins.
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Please specify if terms of license are complied with! (2009-08-07). "Geocaching Trip in Köln". Querfeldeins.
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Ingrid Buss (Oktober 2011). "Es hätt noch immer joot jejange - Kölner Lebensart". KurT's: 1. Kurhaus Wohnresidenzen GmbH. Retrieved on 2011-11-12. Name ok, no license
2011-11-12: E-mail sent to publisher about missing license