Winton, L.L., (1964), "External Needle Morphology of Diploid and Polyploid Juvenile White and Black Spruce", Minnesota Forestry Notes 145, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Scientific Journal Paper Series No. 5451 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..
External Needle Morphology of Diploid and Polyploid Juvenile White and Black Spruce.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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