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https://carrerasdemontana.com/2012/12/23/rutas-trail-running-guadarrama-maraton-alpino-bandolero-41kd2-100m-circuito-cercedilla-bola-del-mundo-penalara/
Rutas Cercedilla: Maratón Alpino Bandolero (41k/D+2.100m) Circuito Cercedilla - Bola del Mundo - Peñalara