Hill, F.J., Bowyer, J.L. and Haygreen, J.G., (1971), "The Size and Quality of Woodsrun Aspen Boltwood in Northern Minnesota", Minnesota Forestry Research Notes 230, School of Forestry, University of Minnesota
Minnesota Forestry Research Notes
Published as Scientific Journal Paper Series No. 7760 of the Minnesota Agricultural Experiment Station.
Hill, F.J.; Bowyer, J.L.; Haygreen, J.G..
The Size and Quality of Woodsrun Aspen Boltwood in Northern Minnesota.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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