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https://carrerasdemontana.com/2017/02/23/basque-ultra-trail-series-2017-bilbao-gasteiz-110k5400d-previa-programa-reglamento-trazado-y-fotos/
Basque Ultra Trail Series 2017, BILBAO-GASTEIZ (110K/+5400D) PREVIA: PROGRAMA, REGLAMENTO, TRAZADO Y FOTOS