Search U.S. government technical reports digitized or harvested by TRAIL.
Timbering along the robbing line :factors influencing falls of roof in coal mines
Stop, look and listen! :the roof is going to fall
State laws relating to coal-mine timbering
Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio
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 the Book Cliffs and Wasatch Plateau Coal Fields in Utah
A study of falls of roof and coal in mines of Lincoln County, Wyoming
A study of mine roof of the Pittsburgh coal bed in the Pittsburgh mining district
A study of falls of roof and coal in Northern Colorado
A study of falls of roof and coal, Rock Springs Coal District, Sweetwater County, Wyo.
Timber withdrawing and devices used for this purpose in some coal mines
A study of timber decay in the Crucible Mine of the Crucible Fuel Co.
Successful use of wooden roof bolts in Stony Point Mine, Stony Point Coal Co., Hopkins County, Ky.
Mine-timber preservation by the collar method :progress report 1
Evaluating anchorage testing methods for expansion-type mine roof bolts
Design and development of precast concrete mine supports :a progress report
Moving longwall shield supports at the York Canyon mine, Raton, N. Mex.
Effects of time between exposure and support on mine roof stability, Bear Coal Mine, Somerset, Colo.
Wood precharring :a novel fire-retardancy technique
Use of steel sets in underground coal
Wood crib fires in a ventilated tunnel