Pederson, H. C.Pickrel, L. J.Olson, F. L.Thompson, E. K.2014-12-302014-12-301957https://hdl.handle.net/11299/16922629 pages; includes charts and mapsThis archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu.Report