Alm, A.A., (1968), "Production and Marketing of Douglas-Fir Christmas Trees in Minnesota", Minnesota Forestry Research Notes 190, School of Forestry, University of Minnesota
Minnesota Forestry Research Notes
Published as Scientific Journal Paper Series No. 6547 of the Minnesota Agricultural Experiment Station.
Production and Marketing of Douglas-Fir Christmas Trees in Minnesota.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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