Search U.S. government technical reports digitized or harvested by TRAIL.
Concentration of manganese ores from Gila, Greenlee, and Graham counties, Ariz.
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