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1by Wright, Wilford S.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1947
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2by Heide, Harold E.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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3“...Report of investigations (United States. Bureau of Mines) ;...”
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4by Mulligan, John J.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1962
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5by Mulligan, John J.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1966
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6“...Report of investigations (United States. Bureau of Mines) ;...”
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7by Mulligan, John J.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1959
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