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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.