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K. Ripcke, Youth work/welfare as a task of lifesaving organisations, in World Conference on Drowning Prevention, Porto, Portugal, 2007. (15.29 KB)
K. Ripcke and Roth, S., WASsERLEBNIS – The Geocaching project around water, adventure and sustainability, in World Conference on Drowning Prevention, Potsdam, Germany, 2013, p. 306.