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Concentration of manganese ores from Gila, Greenlee, and Graham counties, Ariz.
Concentration of oxide manganese ores from the vicinity of Long Valley, Coconino County, Ariz.
Concentration of manganese ores from Lincoln County, Nev.
Concentration of oxide manganese ores from the Tintic district, Eureka, Juab County, Utah
Concentration of oxide manganese ore from Doyle-Smith claims, Northern Yuma County, Ariz.