Turnquist, Orrin C.Lofgren, JohnJohnson, Herbert2019-05-022019-05-021964https://hdl.handle.net/11299/202702This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu. See revision of most recent years. Superceded by MN2000 EB #422enReport