Mr MALOF (tout à droite) le fondateur de ENTREPRISE, s'initie à l’escalade en 1953, à l’âge de 14 ans, comme membre du Club de Fauconnerie de la Californie du Sud. Un des dirigeants de ce club, Don Prentice, apprend alors aux garçons comment descendre les falaises en rappel jusqu'aux aires des faucons. Cette simple leçon fait naître chez Yvon une passion pour l'escalade qui perdurera toute sa vie.
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