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1by Wright, Wilford S.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1947
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2Published 1948“...Report of investigations (United States. Bureau of Mines) ;...”
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Government Document eBook -
3by Erickson, Aner W.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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Government Document eBook