U.S. Geological Survey circular/U.S. Geological Survey Circular · 1953 · 49 citations · 5 references
Natural SciencesSoil SciencesSoil ScienceBiomass Resource Assessment
Area containing lignite beds less than 2 1/2 feet thick Figure•l.--
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Correlation of Sentinel Butte Shale in Western North Dakota
Roland W. Brown · AAPG Bulletin · 1948 · 25 citations