Avery, G., (1958), "Slotted Clip Board for Viewing Aerial Photos", Minnesota Forestry Notes 63, School of Forestry, University of Minnesota
Minnesota Forestry Notes
Published as Miscellaneous Journal Paper Series No. 964 of the Minnesota Agricultural Experiment Station.
Slotted Clip Board for Viewing Aerial Photos.
St. Paul, Minn. : School of Forestry, University of Minnesota.
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