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https://carrerasdemontana.com/2012/07/29/rutas-sierra-madrid-cercedilla-a-segovia-por-la-ruta-de-los-100km-madrid-segovia-35kd630m3-5h/
Rutas Cercedilla: Cercedilla a Segovia siguiendo los 100km Madrid-Segovia (35k/D+630m/3-5h)