Some training in photogeologic procedures is also offered in formal courses 
of instruction given by the Topographic Division in Washington, D. C., and Denver, 
Colorado. Photogeologic training complements these courses, which are designated 
to familiarize geologists with photogrammetric principles, instrumentation, and tech- 
niques. 
To sum up the present status of organized photogeologic work as carried on 
primarily by personnel of the Photogeology Section of the Geological Survey, then, 
we may say that operations account for the greatest expenditure of effort; that re- 
search on a small scale is conducted primarily along with operations; and that formal 
and informal training has been established on a permanent basis. 
INT.-DUP. SEC., WASH., D.C. 97uuQ