Search U.S. government technical reports digitized or harvested by TRAIL.
Control of sulfur and ash in mine-run metallurgical coal :report [No.] 1
Use of scrapers and other light earth-moving equipment in bituminous-coal strip mining
Mechanical mining in some bituminous-coal mines.
Castleman Basin, Garrett County, Maryland
Coal Deposits in the Deep River Field, Chatham, Lee, and Moore Counties, N.C.