Alm, A.A.2010-02-152010-02-151968-04-15Alm, A.A., (1968), "Production and Marketing of Douglas-Fir Christmas Trees in Minnesota", Minnesota Forestry Research Notes 190, School of Forestry, University of Minnesota0544-3555https://hdl.handle.net/11299/57806Published as Scientific Journal Paper Series No. 6547 of the Minnesota Agricultural Experiment Station.en-USforests and forestryMinnesotaresearchReport