Darr, D., Skok, R.A. and Smith, M., (1967), "Retail Christmas Tree Sales in the Twin City Area - 1966", Minnesota Forestry Notes 184, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Scientific Journal Paper Series No. 6366 of the Minnesota Agricultural Experiment Station.
Darr, David; Skok, Richard A.; Smith, Marvin.
Retail Christmas Tree Sales in the Twin City Area - 1966.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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