by Meyer D.W, Helm J.L
Year of Publication 1994

by Burns, D.L, Green, J.M, Anand, S.C, Helm, J.L
Published in Crop science (1981)

by Burns, D.L, Green, J.M, Anand, S.C, Helm, J.L
Published in Crop science (1981)

by Helm, J.L
Published in Proceedings of the Great Plains Agricultural Council (USA) (1993)

by Helm, J.L
Year of Publication 1978

by Helm, J.L. (comp.) (NDSU.)
Published in NDSU Extension Service : [publication] (USA) (01.12.1994)

by Helm, J.L
Published in Glandless Cotton; Proceedings of a Conference (1978)

by Helm, J.L, Zuber, M.S
Published in Crop science (1972)

by Helm, J.L. (comp.)
Published in NDSU Extension Service [publication] - North Dakota State University (1991)

by Helm, J.L, Grafton, K
Published in NDSU Extension Service : [publication] (1986)

by Helm, J.L. (NDSU Extension Service)
Published in NDSU Extension Service : [publication] (USA) (01.06.1993)

by Helm, J.L, Zuber, M.S
Published in Crops and soils (1970)

by Zuber, M.S, Helm, J.L
Published in Maize genetics cooperation news letter (1973)

by Helm, J.L. (NDSU Extension Service), Meyer, D.W
Published in NDSU Extension Service : [publication] (USA) (01.08.1993)

by Helm, J.L, Donnelly, B.J, Glover, D.V
Published in Agronomy journal (1974)

by Newton, H.C. Jr, Middleton, G.K, Green, J.M, Helm, J.L
Published in Crop science (1980)

by Donnelly, B.J, Helm, J.L, Lee, H.A
Published in Cereal chemistry (1973)

by Helm, J.L. (comp.) (North Dakota State University)
Published in NDSU Extension Service [publication] - North Dakota State University (USA) (01.12.1992)

by Helm, J.L. (North Dakota State University, Fargo, ND.)
Published in NDSU Extension Service : [publication] (USA) (01.12.1993)

by Helm, J.L. (North Dakota State University, Fargo, ND.)
Published in NDSU Extension Service : [publication] (USA) (01.12.1993)