Stevens, StanleyDahl, ReynoldShane, RichardHammond, JeromeFuller, EarlSifferath, WarrenHarris, AllanMurra, GeneHughes, HarlanNoll, SallyHamre, MelThomas, KennethFales, PerryPflueger, Burton2019-09-182019-09-181987https://hdl.handle.net/11299/2074201 online resource (PDF, 14 pages)This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu.enReport