Precious metals in ...
Geological Survey (U.S.); United States. Bureau of Mines.; United States. Bureau of Mines. Branch of Metals.; United States. Bureau of Mines. Branch of Data Collection and Coordination.; Geological Survey (U.S.). Metals Section.; Geological Survey (U.S.). Data Collection and Coordination Section.
Washington, DC : U.S. Dept. of the Interior, U.S. Geological Survey 1995
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