Search U.S. government technical reports digitized or harvested by TRAIL.
The economic relation of accidents and preventable diseases to the coal-mining industry
Coal-mine fatalities in the United States, 1922
Falls of roof and coal in bituminous coal-mines
Coal-mine fatalities in October, 1926
Production of explosives in the United States :during the calendar year 1927
The National Safety Competition to assist in the reduction of mine and quarry accidents
Falls of roof in bituminous coal mines :influence of the seasons and rate of production