Browsing by Author "Helgeson, E. A."
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Item Chemical Control of Brush and Shrubs(North Dakota State University, 1956) Widdifield, R. B.; Helgeson, E. A.Item Chemical Control of Perennial Weeds(North Dakota State University, 1953) Widdifield, R. B.; Helgeson, E. A.Item Chemical Weed Control in field crops and for perennial weeds(North Dakota State University, 1963) Jensen, L. A.; Nalewaja, John; Helgeson, E. A.Item Chemical Weed Control in field crops and for perennial weeds(North Dakota State University, 1962) Jensen, L. A.; Helgeson, E. A.Item Chemical Weed Control in growing crops(North Dakota State University, 1953) Helgeson, E. A.; Widdifield, R. B.Item Chemical Weed Control in North Dakota Field Crops(North Dakota State University, 1956) Widdifield, R. B.; Helgeson, E. A.Item Chemical Weed Control in North Dakota Field Crops(North Dakota State University, 1958) Jensen, L. A.; Helgeson, E. A.Item Chemical Weed Control in North Dakota Field Crops(North Dakota State University, 1960) Jensen, L. A.; Helgeson, E. A.Item Chemical Weed Control in North Dakota Field Crops(North Dakota State University, 1957) Jensen, L. A.; Helgeson, E. A.Item Chemical Weed Control in North Dakota Field Crops(North Dakota State University, 1959) Jensen, L. A.; Helgeson, E. A.Item Control of Perennial Sow Thistle(North Dakota State University, 1945) Helgeson, E. A.Item Control of Quackgrass(North Dakota State University, 1945) Helgeson, E. A.Item Perennial Weed Control(North Dakota State University, 1957) Jensen, Lars A.; Helgeson, E. A.Item Perennial Weed Control(North Dakota State University, 1959) Jensen, L. A.; Helgeson, E. A.Item Suggestions for Control of Canada Thistle(North Dakota State University, 1945) Helgeson, E. A.Item Weed Control with T.C.A. and M.C.P.(North Dakota State University, 1952) Helgeson, E. A.; Kratochvil, D. E.; Widdifield, R. B.