Fenster, William E.Overdahl, Curtis J.Simkins, Charles A.Grava, JohnSchoper, Robert P.2014-12-302014-12-301978https://hdl.handle.net/11299/16902136 pages; includes drawings and maps. 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.en-USNewsletter or Bulletin