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Eidg. Technische Hochschule 
Institut fur Geodasie und Photo- 
grammetrie 
Zurich 
Ministry of Lands, Settlement and 
Water Development, Survey Division, 
Dar Es Salam 
Royal Thai Survey Department 
Bangkok 
Secretariat, d Etat aux Travaux 
Publics et a 1 Habitat 
The Air Survey Co of Africa (Pty) Ltd. 
P.O. Box 2836 Durban 
Photosurveys (Pty) Ltd. 
Johannesburg 
Division of National Roads - Depart- 
ment of Transport 
Pretoria 
Army Map Service 
Corps of Engineers 
Arizona Highway Dept. 
Phoenix Àr'iz'on'sa 
State Highway Commision of Kansas, 
Photogr.Sec. 
Topeka Kansas 
Mark Hurd, Aerial Surveys, Inc. 
Minneapolis 
Montana Highway Comission 
Helena Montana 
Commonwealth of Pennsylvania, Dept. 
of Highways 
Harrisburg Pennsylvania