sideration, or, if the area has not yet been photographed, by taking such photo- 
graphs and then preparing topographical maps from them for those parts of the 
area which have to be opened up. 
Bibliography. 
1) Ir. A. J. van der Weele. 
Fotogrammetrie (Servire's Encyclopaedie 1951, Afd. Geodesie C/5/2). 
2) HL Criswell MC, M.LCE. 
The Art of Reconnaissance. 
Roads and Road Construction, May, 1948. 
3) William T. Pryor. 
Aerial Survey Methods solve Highway Location Problems in Tropics. 
Civil Engineering, October, 1949. 
4) C. A. J. von Frijtag Drabbe. 
Grondonderzoek in Nederland met behulp van luchtfoto’s. 
Ir. FL A. M. C. Dibbits 
Luchtfotografie als hulpmiddel bij de exploratie en exploitatie van de bodem 
en bij het grondonderzoek voor bouwtechnische doeleinden. 
Dr. H. Boissevain. 
Geologische interpretatie van luchtfoto's. 
Weg en Waterbouw No. 3—4, March-April 1949. 
5) Various articles in Photogrammetric Engineering. 
William T. Pryor. 
Aerial Surveys in Highway Location. 
Vol. XII, December, 1946. 
Proceedings of the Fourteenth Annual Meeting. 
Vol. XIV, March, 1948. 
Symposium: ,,Photogrammetry in Highway Engineering”. 
Elmer C. Houdlette. 
Research Investigation of the Use of Aerial Photography for Highway Loca- 
tion in Massachusetts. 
H. J. Spelman. 
Photogrammetry in Highway Engineering. 
Ralph J. Lehman. 
Ohio Adapts Aerial Photogrammetry to Highway Engineering. 
Vol. XV, March, 1949. 
Jean E. Hittle. 
Airphoto Interpretation of Engineering Sites and Materials. 
Vol. XV, December, 1949. 
William T. Pryor. 
Specifications for Aerial Photography and Mapping by Photogrammetric 
Methods for Highway Engineering Purposes. 
Vol. XVI, June, 1950. 
L.L Funk. 
Application of Photogrammetric Methods to Highway Location and Design. 
Vol. XVII, December, 1951. 
    
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