Clausen, K.E. and Rudolf, P.O., (1958), "Germination of 29-Year Old Red Pine Seed", Minnesota Forestry Notes 72, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Scientific Journal Paper Series No. 3995 of the Minnesota Agricultural Experiment Station.
Clausen, Knud E.; Rudolf, Paul O..
Germination of 29-Year Old Red Pine Seed.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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