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https://carrerasdemontana.com/2016/12/08/basque-ultra-trail-series-2017-el-origen-marcha-de-las-cuatro-catedrales-shebe-pena-1953-opinion-por-mikel-leal/
Basque ultra trail series 2017, el origen: Marcha de las Cuatro catedrales, Shebe Peña - 1953. Opinión, por Mikel Leal