Search U.S. government technical reports digitized or harvested by TRAIL.
Bituminous coal-mine safety-inspection outline
Multiple-shift mechanical mining in some bituminous-coal mines.
Mechanical mining in some bituminous-coal mines.
Statistical data on the mechanical cleaning of bituminous coal in the United States
Costs of mining under bolted roof and timbered roof in bituminous coal mines
Computer program for economic evaluations of underground bituminous coal mines
Strippable reserves of bituminous coal and lignite in the United States
Coal recovery from underground bituminous coal mines in the United States, by mining method