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• Milling methods and costs at the Montana mine concentrator of the Eagle-Picher Lead Co., Ruby, Ariz.
• Design, equipment, and construction costs of Davis-Dunkirk concentrator, Prescott, Ariz.
• Arizona manganese-silver ores
• Mining and milling methods at San Xavier mine, the Eagle-Picher Mining & Smelting Co., Pima County, Ariz.