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Concentration of manganese ores from Gila, Greenlee, and Graham counties, Ariz.

Concentration of Colorado fluorite ores

Concentration of oxide manganese ore from Sheep Mountain property, Durkee district, Oreg.

Beneficiation of oxide and carbonate manganese ores from the Philipsburg District, Granite County, Mont.

Concentration of oxide manganese ores from the Havasu Lake District, California and Arizona

Concentration of copper-cobalt ores from the Blackbird District, Lemhi County, Idaho


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