Robinson, R. G.Johnson, F. K.Soine, O. C.2014-12-302014-12-301967https://hdl.handle.net/11299/16879131 pages; includes photographs and 1 plan. 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