Christopherson, C. H.White, H. B.Neubauer, L. W.2014-12-302014-12-301937-09https://hdl.handle.net/11299/16853616 pages; includes photographs and plans. 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