Schantz-Hansen, T. and Hall, O.F., (1952), "Results of Testing Exotic Trees and Shrubs for Hardness in Northern Minnesota", Minnesota Forestry Notes 5, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Scientific Journal Series Paper #2877 of the Minnesota Agricultural Experiment
Schantz-Hansen, T.; Hall, O.F..
Results of Testing Exotic Trees and Shrubs for Hardness in Northern Minnesota.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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