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Coal mining
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Plan general de dirección y beneficio para las minas de carbón de Hornaquera de Guesna, elaborado...
Plan general de dirección y beneficio para las minas de carbón de Hornaquera de Guesna, elaborado por Gregorio González Azaola
Apuntes relativos a la empresa de navegación y a las minas de carbón de Villanueva del Río
Apuntes relativos a la empresa de navegación y a las minas de carbón de Villanueva del Río