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Chemical Analyses of Lignite from the Sentinel Butte Member of the Fort Union Formation, Dunn Center Field, Dunn County, North Dakota

Joseph R. HatchRonald H. Affolter

出版	U.S. Geological Survey, 1978
URL	http://books.google.com.hk/books?id=Vpw4twAACAAJ&hl=&source=gbs_api