Search U.S. government technical reports digitized or harvested by TRAIL.
A ventilation study of the Graceton Coal & Coke Co. mine, Graceton, Pa.
Some suggestions on the prevention of electrical accidents in coal mines
Studies of roof movement in coal mines.
Studies of roof movement in coal mines.
A study of timber decay in the Crucible Mine of the Crucible Fuel Co.
Studies of roof movement in coal mines.
Multiple-shift mechanical mining in some bituminous-coal mines.
An analysis of the use of electricity at coal mines.
Cementation of bituminous-coal-mine roof strata.
Cementation of bituminous-coal-mine roof strata :injection of epoxy and polyester-type resins