Search U.S. government technical reports digitized or harvested by TRAIL.
Roof bolting in the United States
Falls of roof :the no. 1 killer in bituminous-coal mines
Administration of the Federal Coal-Mine Safety Act
Permissible mine equipment approved during the calendar years 1953-54
Administration of the Federal Coal-Mine Safety Act, calendar year 1955
Administration of the Federal Coal-Mine Safety Act :calendar year 1954
Administration of the Federal Coal-Mine Safety Act, calendar year 1956
Administration of the Federal Coal-Mine Safety Act, calendar year 1957