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Excerpt from Memorias de la Comisión del Mapa Geologico de España, Vol. 2: Descripción Fisica, Geológica y Minera de la Provincia de Huelva; Tercera Parte de la Memoria; Descripción Minera
La importancia que en estos últimos tiempos ha alcanzado la pro vincia de Huelva, ha sido indudablemente debida a la rehabilitación de las minas de piritas y su explotación en grande escala, asi como al descubrimiento de las de manganeso, bastando para comprenderlo presentar diferentes números sacados de documentos oficiales.
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