Search U.S. government technical reports digitized or harvested by TRAIL.
Precautions to be observed in entering abandoned exploratory shafts and pits
Mine Safety Board decision 28 :safety catches and arresting devices for cages, skips, and cars in mine shafts and slopes
Shaft design in the Coeur d'Alene mining district, Idaho :results of in situ stress and physical property measurements
Evaluating ventilation parameters of three coal mine gobs