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Item Economic Contribution of the Lignite Industry to the North Dakota Economy(North Dakota State University, 1983) Coon, Randal C.; Mittleider, John F.; Leistritz, F. LarryItem Erosion and Nutrient Loss From Interrill Areas on Strip-Mine Land Topsoils(North Dakota State University, 1983) Lang, Kent J.; Prunty, Lyle