Hanson, Lowell D.Bruns, Edward L.Rust, R. H.2014-12-302014-12-301976https://hdl.handle.net/11299/16882434 pages; includes photographs, 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