h) see C.d. 
i) Manufacturers of photogrammetric equipments do not exist 
in the Netherlands. 
D) GENERALITIES. 
a) and b). Especially in connection with the maps from tropical 
areas we can answer these questions in the affirmative. 
Ir. J. A. C. E. van RoERMUND, 
Chief of the Survey Section of the Topographic Service, Reporter 
Delft, the 21 th March 1952. 
  
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