The photos you find at commons:Category:Hackaton Berlin 2011 --Ralf Roletschek 14:57, 13 May 2011 (UTC)
Topic on Talk:Berlin Hackathon 2011
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The photos you find at commons:Category:Hackaton Berlin 2011 --Ralf Roletschek 14:57, 13 May 2011 (UTC)