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HISTORIA DE LOS ESTADOS UNIDOS DE AMÉRICA EN EL SIGLO XIX ...

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Historia de los inventos (Sucesos N° 12) - Edwin Harrington y ...

EL PALEOLÍTICO: Una de las fases del desarrollo humano en que se crearon todos los medios elementales para sobrevivir: el trabajo para convertir piedras, huesos y maderos en armas y herramientas con participación del grupo, único camino para imponerse a condiciones hostiles.

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