Clausen, K.E., (1959), "New Data on Distribution of the Paper Birch x Bog Birch Hybrid in Minnesota", Minnesota Forestry Notes 81, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Scientific Journal Paper Series No. 4195 of the Minnesota Agricultural Experiment Station.
This study was made possible by a grant from the Charles K. Blandin Foundation, Grand Rapids, Minnesota.
Clausen, Knud E..
New Data on Distribution of the Paper Birch x Bog Birch Hybrid in Minnesota.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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