INTERNATIONAL SOCIETY FOR PHOTOGRAMMEIRY 
COMMISSION IV-3 
President: T. J. Blachut, Canada 
Members: Ch. Broillett, Switzerland 
G. C. Tewinkel, U.S.A. 
SECOND INTERNATIONAL MAPPING 
EXPERIMENT 
RENFREW TEST AREA 
Report to the 
IXth INTERNATIONAL CONGRESS OF PHOTOGRAMMETRY 
London 1960