TECHNICAL UNIVERSITY OF HELSINKI 
INSTITUTE OF PHOTOGRAMMETRY 
| 
| ON THE DEFORMATION OF POLYESTER FILM 
| A study the deformations of polyester base 
| film used in the international controlled 
| photogrammetric experiment PECNY 1966-1968 
Prof. Dr. R.S. Halonen 
Dipl. Eng. Aino Savolainen 
OTANIEMI FINLAND