Winton, L.L., (1964), "Natural Polyploidy in Juvenile White and Black Spruce", Minnesota Forestry Notes 144, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Scientific Journal Paper Series No. 5452 of the Minnesota Agricultural Experiment Station.
This study was made possible by a grant from the Charles K. Blandin Foundation,
Grand Rapids, Minnesota.
Winton, Lawson L..
Natural Polyploidy in Juvenile White and Black Spruce.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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