Search U.S. government technical reports digitized or harvested by TRAIL.
Technology and use of lignite.Proceedings: Bureau of Mines-University of North Dakota Symposium, Grand Forks, N. Dak., April 29-30, 1965
Fly ash utilization :proceedings, Edision Electric Institute - National Coal Association - Bureau of Mines Symposium, Pittsburgh, Pennsylvania, March 14-16, 1967