Assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the United States: A Portable Document (PDF) recompilation of USGS Open-File Report 96-96 and Circular 1178
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2004 ◽
Vol 13
(3)
◽
pp. 201-207
◽
2017 ◽
Vol 49
◽
pp. 233-250
◽