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1.- Preliminary geologic map of the Laredo, Crystal City-Eagle Pass, San Antonio, and Del Rio 1 degrees X 2 degrees quadrangles, Texas, and the Nuevo Laredo, Ciudad Acuna, Piedras Negras, and Nueva Rosita 1 degrees X 2 degrees quadrangles, Mexico U. S. Geological Survey; Reston, VA; USA; United States, 2009 Ver registro
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