Search U.S. government technical reports digitized or harvested by TRAIL.
Mining methods used in the Grundy coal field of Buchanan County, Va.
Some aspects of strip mining of bituminous coal in Central and South Central states
Shaft- and slope-bottom lay-outs at coal mines
Multiple-shift mechanical mining in some bituminous coal mines.
Analyses of Tennessee coals (including Georgia).
Statistical data on the mechanical cleaning of bituminous coal in the United States