Gerbig, B.H., Ulliman, J.J. and Sucoff, E.I., (1972), "Aerial Photo Detection of Highway-Associated Damage to Red Pine", Minnesota Forestry Research Notes 239, School of Forestry, University of Minnesota
Minnesota Forestry Research Notes
Published as Scientific Journal Paper Series No. 8113 of the Minnesota Agricultural Experiment Station.
Gerbig, Bruce H.; Ulliman, Joseph J.; Sucoff, Edward I..
Aerial Photo Detection of Highway-Associated Damage to Red Pine.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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