Search U.S. government technical reports digitized or harvested by TRAIL.
Design and operation of the coal planer, Ruhr District, Germany
Some roof-control practices in coal mines of the United Kingdom
Anthracite mechanical mining investigations.
Anthracite mechanical mining investigations.
Anthracite mechanical mining investigations.
Experimental longwall mining in a Pennsylvania anthracite mine (In two parts).
Hydraulic mining of anthracite :engineering development studies