Hanson, L.D.Overdahl, C.J.Halverson, M.V.Grava, John2019-05-012019-05-011964-02https://hdl.handle.net/11299/202666See current revision #1 Superceded by MN2000 EB #416. 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