Irving, F.D., Beer, J.R. and Hall, O.F., (1956), "Sugar Maple Bark Injury by Gray Squirrels in a Minnesota Woodlot", Minnesota Forestry Notes 54, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Scientific Journal Paper Series No. 3690 of the Minnesota Agricultural Experiment Station.
Irving, F.D.; Beer, J.R.; Hall, O.F..
Sugar Maple Bark Injury by Gray Squirrels in a Minnesota Woodlot.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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