Search U.S. government technical reports digitized or harvested by TRAIL.
What the superintendent of a coal mine might do to prevent injury from falls of roof
What the mine foreman can do to prevent injury from falls of roof in coal mines
Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio
Reducing accidents from falls of roof in coal mines
What the coal miners can do to prevent injury from falls of roof
A study of falls of roof and coal in mines in the number 8 field of eastern Ohio
Roof support in coal mines in the Irwin, Greensburg and Latrobe Basins, Westmoreland County, Pa.
A study of falls of roof and coal in mines of Harrison County, West Virginia
Falls of roof and coal in mines operating in the Sewickley coal bed in Monongalia County, W. Va.
A study of mine roof of the Pittsburgh coal bed in the Pittsburgh mining district
How to prevent death and injury from falls of roof in coal mines
Timber withdrawing and devices used for this purpose in some coal mines
Places of occurrence of injury from falls of roof
A study of roof in Pennsylvania mines contiguous to Monongahela River
Falls of roof in mines operating in the Pittsburgh Coal Bed, West Virginia
A study of mine roof of the coking district of Western Pennsylvania