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https://carrerasdemontana.com/2016/08/20/ultra-trail-mont-blanc-historia-2003-2016-del-tour-mont-blanc-en-siete-etapas-a-la-cima-mundial-del-trail/
Ultra Trail Mont-Blanc, historia 2003-2016: Del Tour Mont Blanc en siete etapas a la cima mundial del trail