Winton, Lawson L.2010-02-102010-02-101964-04-15Winton, L.L., (1964), "Natural Polyploidy in Juvenile White and Black Spruce", Minnesota Forestry Notes 144, School of Forestry, University of Minnesota0099-4332https://hdl.handle.net/11299/57450Published as Scientific Journal Paper Series No. 5452 of the Minnesota Agricultural Experiment Station.en-USforests and forestryMinnesotaresearchReport