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Concentration of oxide manganese ores from the Havasu Lake District, California and Arizona
Concentration of Colorado fluorite ores
Concentration of oxide manganese ore from Sheep Mountain property, Durkee district, Oreg.
Concentration of copper-cobalt ores from the Blackbird District, Lemhi County, Idaho
Concentration of oxide manganese ores from Lander County, Nev.
Concentration of oxide and silicate manganese ores from the vicinity of Golconda, Nev.