* c. 
E 
ue t» = I d m € 
. Www Wis Ns + Sa. NS: M. 
  
S. JACK FRIEDMAN 
AMERICAN COMMERCIAL PRACTICES IN 
LARGE SCALE TOPOGRAPHIC MAPPING 
COMMUNICATION AT THE IX INTERNATIONAL CONGRESS 
OF PHOTOGRAMMETRY - LONDON 
5.17 SEPTEMBER 1960 
IV Commission