Search U.S. government technical reports digitized or harvested by TRAIL.
Statistical analysis of the progress in mechanical cleaning of bituminous coal from 1927 to 1934
An explanation of washability curves for the interpretation of float-and-sink data on coal
A washability study of the Black Creek Coal bed at Yolande No. 6, Rockcastle, Ala.
Classification and tabling of table middlings at the Colta Coal Washery, Flat Creek, Ala.