Search U.S. government technical reports digitized or harvested by TRAIL.
Analyses of West Virginia coals
Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio
Comparison of storage-battery and cable-reel gathering locomotives in a West Virginia coal mine
Falls of roof in mines operating in the Pittsburgh Coal Bed, West Virginia
Bleeder system in virgin area in a Pittsburgh coalbed mine
Selected geologic factors affecting mining of the Pittsburgh coalbed
Coal mine floor heave in the Beckley coalbed,an analysis
Slickenside occurrence in coal mine roof of the Valley Camp no. 3 mine near Wheeling, W. Va.
Effects of horizontal stress related to stream valleys on the stability of coal mine openings