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1.- 1998 Assessment of Undiscovered deposits of gold, silver, copper, lead, and zinc in the United States
Geological Survey (Estados Unidos). National Mineral Resource Assessment Team
Denver: US Geological survey, 1999
IV / 9 - 6 - 1
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2.- REFERENCIA DE AUTORIDAD
U.S. Geological Survey; United States Geological Survey; USGS VEASE:; Geological Survey (Estados Unidos); Geological Survey (Estados Unidos), ed.; Geological Survey (Estados Unidos). National Mineral Resource Assessment Team; Geological Survey (Estados Unidos)...[et al.]
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