Search U.S. government technical reports digitized or harvested by TRAIL.
Industrial engineering practice at selected metal mines in western states
Yieldable steel arches and yieldable steel ring supports in metal mines
Mining method, technique, and cost of presplitting the flood control gate shaft, Littleville Dam, Huntington, Mass.
Mining methods and practices at the Young Mine, American Zinc Co. of Tennessee, Jefferson County, Tenn.
Longwall mining in bituminous coal mines with planers, shearer- loaders, and self-advancing hydraulic roof supports