Clausen, Knud E.2010-02-042010-02-041959-07-15Clausen, 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 Minnesota0099-4332https://hdl.handle.net/11299/57223Published as Scientific Journal Paper Series No. 4195 of the Minnesota Agricultural Experiment Station.en-USforests and forestryMinnesotaresearchReport