Search U.S. government technical reports digitized or harvested by TRAIL.
Effect of energy and impact direction on coal fragmentation
Zero-surface-charge-controlled drilling for enhanced penetration and extended bit life
Evaluation of high-pressure front-mounted water jets for frictional-ignition suppression
Evaluation of water-jet-assisted cutting capability on longwall shearers
Crushed stone and sand and gravel production by state districts :1985-1986