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., May 1-2, 1969
Technology and use of lignite :proceedings: Bureau of Mines - University of North Dakota Symposium, Bismarck, N. Dak., May 12-13, 1971
Technology and use of lignite.Proceedings: Bureau of Mines-University of North Dakota Symposium, Grand Forks, N. Dak., May 9-10, 1973.