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
Geologic conditions affecting coal mine ground control in the western United States
Hillseam geology and roof instability near outcrop in eastern Kentucky drift mines