Osseous Material Industry from the Magdalenian Levels of La Peña de Estebanvela (Segovia) : A Preliminary Technological Study. - Tejero Cáceres, José Miguel (The sound of bones : proceedings of the 8th meeting of the ICAZ Worked Bone Reserarch Group in Salzburg, [August 29 - September 3], 2011, 2013)