• Geology of Mina Plomosas area, Chihuahua, Mexico 

    Bridges, Luther Wadsworth, 1931- (2010-09-20)
    Three previously unrecognized outcrops of pre-Carboniferous rock in the Mina Plomosas - Placer de Guadalupe area have a total area of slightly less than four square miles. Six units, ranging in age from Ordovician to ...