Johnson, G., Ulliman, J., Zasada, Z. and Meyer, M., (1973), "Application of 70mm Aerial Photography to Mechanized Timber Harvest Disturbance Assessment", Minnesota Forestry Research Notes 246, School of Forestry, University of Minnesota
Minnesota Forestry Research Notes
Published as Scientific Journal Paper Series No. 8520 of the Minnesota Agricultural Experiment Station.
Johnson, G.; Ulliman, J.; Zasada, Z.A.; Meyer, M..
Application of 70mm Aerial Photography to Mechanized Timber Harvest Disturbance Assessment.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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