GVII-2 (Sup.) 
photographs extensively in research and field mapping« They 
use their own equipment which is similar to that mentioned 
above* 
The Universities of Zurich, Berne and Lausanne in 
Switzerland give separate courses for advanced students 
of geology and geography. They also use photographs 
extensively in research and advanced studies of special 
problems, as well as in field mapping. Their equipment 
comp rises mirror stereoscopes and parallax bars. 
The geological and geographical departments of the 
University of Basle, Switzerland do not give courses 
specially den ted to photo interpretation. They teach 
the method as may be required in their general practical 
training and use it in advanced research and field mapping. 
All these Swiss institutions possess collections of 
specially suited photographs. Moreover they can either 
buy or hire on exceedingly favorable terms photographs 
from the archives of the Federal Topographical and 
Cadastral Surveys. All these photographs are governed 
by the requirements of photo gramme trie surveying. The 
air transport company "Swissair” possesses a collection 
of about 20,000 photos of Switzerland, mostly obliques, 
which are also available. They were not taken for 
surveying purposes and are, in general, not suitable 
for stereoscopic examination. 
The extensive training courses given at the International 
Training Center for Aerial Survey, Delft, the Netherlands, 
were covered in the 1952 Commission VII report.