Haygreen, J.G., (1970), "The Strength of Aspen Studs", Minnesota Forestry Research Notes 221, School of Forestry, University of Minnesota
Minnesota Forestry Research Notes
Published as Scientific Journal Paper Series No. 7359 of the Minnesota Agricultural Experiment Station.
Haygreen, John G..
The Strength of Aspen Studs.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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