Search U.S. government technical reports digitized or harvested by TRAIL.
Analyses of Kansas coals / [by the U.S. Bureau of Mines].
Ten years of fatal accidents and two years of accident costs in Indiana coal mining
Working an underground mine 6 years without lost-time accidents
The use of treated mine ties and timbers in Illinois and Indiana coal mines
Explosions in Illinois coal mines 1883 to 1932