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https://carrerasdemontana.com/2013/02/07/trail-running-sobre-nieve-material-y-tecnica-para-correr-por-la-nieve-por-raul-frechilla-y-mayayo/
TRAIL RUNNING SOBRE NIEVE: Material y t├ęcnica para correr por la nieve, por Raul Frechilla y Mayayo