Marple, Dennis N.Christian, Lauren L.Judge, Max D.Epley, Richard J.Heger, Wm. J., Mrs.Schafer, David E.2019-09-182019-09-181986https://hdl.handle.net/11299/2073141 online resource (PDF, 3 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