Search U.S. government technical reports digitized or harvested by TRAIL.
Hydraulic coal mining research :equipment and preliminary tests
Bureau of mines research and technologic work on coal, 1960
Effects of selected operating variables on continuous-cell flotation of coal :a laboratory study
Bureau of mines research and technologic work on coal, 1959
Bureau of mines research and technologic work on coal, 1962
Bureau of mines research and technologic work on coal, 1961
Bureau of Mines research and technologic work on coal, 1963
Bureau of mines research and technologic work on coal, 1964
Coal research organizations :worldwide activities and publications