Clausen, K.E. and Kraus, J.F., (1961), "Air-Layering of Birch", Minnesota Forestry Notes 102, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Scientific Journal Paper Series No. 4539 of the Minnesota Agricultural Experiment Station.
This study was supported in part by a grant from the Charles K. Blandin Foundation,
Grand Rapids, Minnesota.
Clausen, Knud E.; Kraus, John F..
Air-Layering of Birch.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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