6 
expert. This is pure photo-interpretation. In view of the great variety in factors influencing 
the processes of soil formation, for instance the climate, the drawing of conclusions from 
the photo-image with regard to soil conditions is hardly justified. The maps produced are 
neither complete nor very precise, though many boundaries of mapping units may be 
indicated very accurately. Often only broad land groups can be distinguished. Still for 
a preliminary and general information in agricultural development schemes and in land 
use planning these kinds of small-scale maps can be of great value. 
REFERENCES. 
Buringh, P. (1953). The role of aerial photography when drafting schemes for under- 
developed countries. Neth. Journ. of Agric. Vol I No. 4. 
> (1954). The analysis and interpretation of aerial photographs in soil survey 
and landclassification. Neth. Journ. of Agric. Se. Vol II No. 1. 
5 (1955). Some problems concerning aerial photo-interpretation in soil survey. 
Neth. Journ. of Agric. Sc. Vol. III No. 2. 
5 and Liere, W. v. (1954). Example of a reconaissance soilmap produced by 
the pedological analysis of aerial photographs, followed by the study of soils 
in the field. Trans. of the VIth Intern. Congr. of Soil Sc. Leopoldville. 
> and Edelman, C. H. (1955). Some remarks about the soils of the alluvial 
plain of Iraq, south of Baghdad. Neth. Journ. of Agric. Se. Vol III No. 1. 
Frost, E. F. (1953): Factors limiting the use of aerial photographs for analysis of soil 
and terrain. Photogr. Eng. Vol. XIX Nr. 3 p. 427. 
Jenny, H. (1941): Factors of soil formation. New York-London. 
Kellog, Ch. E. (1954) : Soil conservation. Trans. 5th Int. Congr. of Soil Se. Leopoldville. 
Vol. 1 ¢.G.2. 
Simonson, BR. W. (1950): Use of aerial photographs in soil surveys. Photogr. Engin. 17, 
p. 308-315. 
Soil Survey Manual (1951) U.S. Dept. Agr. Handbook No. 18. Washington. 
Stephens, C. G. (1953): Soil surveys for land development, FAO Agr. Studies No. 20, 
Rome. 
Veenenbos, J. S. (1956): Small scale pedological photo-analysis and map compilation 
Trans. of the VIIth Int. Congr. of Soil Sc. Paris.