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• Factors governing the selection of the proper level interval in underground mines
• Mining methods and costs at the Westside Mine of the Eagle-Picher Co., Cherokee County, Kans.
• Mining and milling methods and costs, Ozark Ore Co., Iron Mountain Iron-Ore Mine, St. Francois County, Mo.
• Mining and milling methods and costs, Tri-State Zinc, Inc., Jo Daviess County, Ill.
• Mining methods and costs at the Hayden Creek Mine of St. Joseph Lead Co., St. Francois County, Mo.