Search U.S. government technical reports digitized or harvested by TRAIL.
Mining methods of the Bunker Hill and Sullivan Mining and Concentrating Co., Kellogg, Idaho
Method and cost of driving the Rock Creek Tunnel, Hecla Mining Co., Shoshone County, Idaho
Economic aspects of silver production in the Coeur d'Alene mining region, Shoshone County, Idaho
Microcomputer-based instrumentation system for monitoring ground support in a deep mine shaft