Search U.S. government technical reports digitized or harvested by TRAIL.
The relation of geology to mine roof conditions in the Pocahontas No. 3 coalbed
Geologic structures in coal mine roof
Geologic factors in coal mine roof stability :a progress report
Coal mine roof instability :categories and causes
The character of five selected LANDSAT lineaments in southwestern Pennsylvania
Hillseam geology and roof instability near outcrop in eastern Kentucky drift mines