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https://carrerasdemontana.com/2017/09/06/basque-ultra-trail-series-2017-donostia-bilbao-6-8oct140km-trazado-y-programa-cierre-inscripciones-8sep/
Basque Ultra Trail Series 2017: (DONOSTIA-BILBAO 6-8OCT/140KM) TRAZADO y PROGRAMA. CIERRE INSCRIPCIONES 8SEP