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Concentration of carbonate and oxide manganese ores from the vicinity of Tracy, Central California

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

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

Concentration of manganese ores from Lincoln County, Nev.

Concentration of manganese ores from Boulder Dam Recreational Area, Clark County, Nev.

Concentration of oxide manganese ores from the Turtle claims and Pacific Coast Manganese properties, Paymaster District, Imperial County, Calif.

Concentration of manganese ores from Piute and Kane counties, southern Utah


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