Search U.S. government technical reports digitized or harvested by TRAIL.
Some aspects of strip mining of bituminous coal in Central and South Central states
Thickness of bituminous coal and lignite seams mined in 1960
Recovery percentage of bituminous coal deposits in the United States (in two parts).
Coal recovery from bituminous coal surface mines in the eastern United States :a survey
Relationship of coal seam parameters and airborne respirable dust at longwalls