Winton, Lawson L.2010-02-112010-02-111964-10-15Winton, L.L., (1964), "Phenology of Normal and Forced Microsporogenesis in White and Black Spruce and Their F1 Hybrid", Minnesota Forestry Notes 153, School of Forestry, University of Minnesota0099-4332https://hdl.handle.net/11299/57510Published as Scientific Journal Paper Series No. 5513 of the Minnesota Agricultural Experiment Station.en-USforests and forestryMinnesotaresearchReport