Waters, Luther, Jr.Riehle, KirstenDufault, Robert J.Pfleger, Frank L.Cranshaw, Whitney2019-09-182019-09-181983https://hdl.handle.net/11299/2073831 online resource (PDF, 8 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