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1.- GEOLOGY AND MINERAL RESOURCE ASSESSMENT OF THE VENEZUELAN GUAYANA SHIELD AT 1:500,00 SCALE; A DIGITAL REPRESENTATION OF MAPS PUBLISHED BY THE U.S. GEOLOGICAL SURVEY
U. S. GEOLOGICAL SURVEY; RESTON, VA; USA; UNITED STATES, 1997
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2.- The Laramide Mesa Formation and the Ojo de Agua Caldera, southeast of the Cananea copper mining district, Sonora, Mexico
U. S. Geological Survey; Reston, VA; USA; United States, 2006
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