Search U.S. government technical reports digitized or harvested by TRAIL.
Kettlebottoms :their relation to mine roof and support
Coal mine air tempering :effectiveness, design, and roof support
Geotechnology in slate quarry operations
The character of five selected LANDSAT lineaments in southwestern Pennsylvania
Hillseam geology and roof instability near outcrop in eastern Kentucky drift mines
Leakage across a bituminous coal mine barrier
Roof control of stress-relief jointing near outcrops in central Appalachian drift coal mines