Snyder, Leon C.Alderman, W. H.Brierley, W. G.2014-12-302014-12-301951-06https://hdl.handle.net/11299/16859816 pages; includes photographs and drawing. 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