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REISEN & TOUREN 2011/2012. ABENTEUER RUHRGEBIET. GPS - Schatzsuche im alten Hüttenwerk (in de) (PDF) 12. Tour de Ruhr GmbH. Retrieved on 2011-06-20. |
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GaLaBauExperten (2014-03-21). 50 Jahre Grün für Menschen (in de). youtube.com. Retrieved on 2014-06-25. |