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Experiments in Fleissner drying of North Dakota lignite
Gasification of lignite in a commercial-scale pilot plant :progress report from July 1, 1950 to December 31, 1951, : and summary of work previous to July 1, 1950
Drying North Dakota lignite to 1,500 pounds pressure by the Fleissner process
Combustion of North Dakota lignite in domestic heaters