REPORT OF COMMISSION VII 
GVII-77 
tive methods should be used in the preparation of maps involving photo inter 
pretation as a means of establishing and maintaining satisfactory levels of pre 
cision, and permitting intelligent evaluation by map users. 
ACKNOWLEDGEMENT 
The authors express thanks to Professor F. X. Schumacher for assistance 
in the analytical procedures, and Mr. Gerald Hale for making the counts on 
the Bangor Quadrangle. 
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