Sullivan, E.T. and Hansen, H.L., (1957), "The Twin City Metropolitan Area as a Market for Norway Pine Christmas Trees", Minnesota Forestry Notes 60, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Scientific Journal Paper Series No. 3798 of the Minnesota Agricultural Experiment Station.
Sullivan, E.T.; Hansen, H.L..
The Twin City Metropolitan Area as a Market for Norway Pine Christmas Trees.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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