Search U.S. government technical reports digitized or harvested by TRAIL.
Mining and milling operations of the Southwestern Graphite Co., Burnet County, Tex.
Alice Zinc Mine, Ozark County, Mo.
Churn drilling at the Capital and Greenland zinc mines, Lawrence County, Mo.
Methods and costs of mining fluorspar from a flat-bedded deposit at Cave-In-Rock, Ill.
Investigation of Douglas fluorite property, Pope County, Ill.