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Item Distribution and Economic Impacts of Leafy Spurge in North Dakota(North Dakota State University, 1983) Messersmith, Calvin G.; Lym, Rodney G.Item Control of Leafy Spurge with Herbicides(North Dakota State University, 1983) Lym, Rodney G.; Messersmith, Calvin G.Item Research Programs for Leafy Spurge Control in the United States and Canada(North Dakota State University, 1983) Messersmith, Calvin G.; Lym, Rodney G.