Search U.S. government technical reports digitized or harvested by TRAIL.
Falls of roof and coal in bituminous coal-mines
Safety achievements of a Pennsylvania bituminous-coal mine and of a coal-mine superintendent
Some coal-mine safety organizations in the Pennsylvania bituminous field
Mining statutes of the state of Pennsylvania(summarized)
Analyses of Pennsylvania bituminous coals
Analyses of Pennsylvania bituminous coals :supplement to Technical Paper 590
Fire fighting facilities at four Pennsylvania bituminous-coal mines