Supplemental Notation for Paper 
THE ROLE OF AERIAL SURVEYS IN HIGHWAY ENGINEERING 
In reference to the procurement of photogrammetric services, a . 
"Reference Cuide Outline--Speeifications for Aerial Surveys and Mapping 
by Photogrammetric Methods for Highways" was first published in 1956 and 
a revised edition was published in 1958. These specifications are par- 
‘ticularly applicable to the obtainment of what is required for accom- 
plishment of the aerial surveys and photogrammetric work essential for 
performance of highway engineering as presented in this paper. This pub- 
lication (Catalog No. C37.6/2:4e8) can be purchased at $0.75 per copy 
from the Superintendent of Documents, U. S. Government Printing Office, 
Washington 25, D, C., U. 8. A. 
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