LITERATUREBURINGH, P., 1960: Soils and soil conditions in Iraq, Baghdad.BURINGH, P., 1960: Photo-interpretation in the I.T.C. Soil Section, I.T.C. Publication B2, Delft.BURINGH, P., 1960: The applications of aerial photography in soil surveys, in: Manual of photographicinterpretation, Washington (D.C.), p. 633 seq.BURINGH, P., STEUR, G. G. L. and VINK, A. P. A., 1962: Some techniques and methods of soil survey inthe Netherlands (in preparation).DURY, G. H., 1960: The face of the earth, Pelican books, no. A 447.GIBBS, H. S., 1959: Soil classification for the user. Soil bureau publication, no. 196, New Zealand.GOOSEN, D., 1961 : A study of geomorphology and soils in the middle Magdalena Valley, Colombia.1.T.C.-Publication B9, Delft.KELLOGG, C. E., 1950: Tropical soils, Trans. IVth Intem. Congr. Soil Sci., Vol. 1,266-276.KELLOGG, C. E., 1955: Soil surveys in modem farming, Journ. Soil and Water Conservation, Vol. 10,271-277.KELLOGG, C. E., 1961 : Soil interpretation in the soil survey, U.S.D.A., Soil Conservation Service Statement,Washington (D.C.).MEESTER, T. DE, 1961 : The application of airphoto analysis in a detailed soil survey in Tanganyika, I.T.C.Publication B 10, Delft.MIKHAILOV, V. Y., 1961 : The use of colour sensitive films in aerial photography in U.S.S.R., Photogrammetria,17,99-10<strong>4.</strong>MOON, J. W., LIGON, W. S. and HENDERSON, J. R., 1949: Soil classification and soil maps: original fieldsurveys. Soil Sci., 67,169-175.NYGARD, I. J. and HOLE, F. D., 1949: Soil classification and soil maps: units of mapping. Soil Sci. 67,163-168.ORVEDAL, A. C., BALDWIN, M. and VESSEL, A. J., 1949: Soil classification and soil maps: compiled maps.Soil Sci. 67, 177-181.PANNEKOEK, A. J., 1961 : Beschouwingen over generalisatie in de kartografie, I & 11. Tijdschrift Kon. Ned.Aardr. Gen., 78,203-210,311-329.PLATONENKO, M. A., 1960: Accuracy in mapping soils from aerial photographs. Translation. Soviet SoilScience, 1960 no. 1 (May 1961).REYNDERS, J. J., 1961 : Soil survey in Netherlands New Guinea. Boor en Spade (“Auger and Spade”), XI,77-81, Wageningen.RIECKEN, F. F., and SMITH, G. D., 1949: Lower categories of soil classification: family, series, type andphase. Soil Sci. 67,107-115.SCHELLING, J., 1961 : The high forest soils of the Central Netherlands. Bodemkundige Studies, 5. Stichtingvoor Bodemkartering, Bennekom.52
LISCHERMERHORN, W., 1961 : De betekenis van luchtkartering voor de huidige wereldontwikkeling. Kon.Ned. Acad. v. Wetenschappen, Afd. Natuurkunde 70, no. 5.<strong>SOIL</strong> SURVEY STAFF, 1951 : Soil Survey Manual, U.S.D.A., Handbook 18, Washington (D.C.).<strong>SOIL</strong> SURVEY STAFF, 1960: Soil Classification (7th approximation), U.S.D.A., Washington (D.C.).STEUR, G. G. L., 1961 : Methods of soil surveying in use at the Netherlands Soil Survey Institute. Booren Spade (“Auger and Spade”), XI,59-77, Wageningen, 1961 ..STEUR, G. G. L., 1961 : De bodemkaart van Nederland op kaartbladen. Landbouwk. Tijdschrift.TRANSACTIONS <strong>OF</strong> <strong>THE</strong> SYMPOSIUM ON PHOTO <strong>INTERPRETATION</strong>, Delft, The Netherlands, September 1962.International Archives of Photogrammetry, XIV.VEENENBOS, J. S., 1957: Methods and costs of soil and land classification surveys. African Soils, Vol. IV,122-135.VERBOOM, W. C., 1961 : Planned rural development in Northern Rhodesia. I.T.C. Publication B12/13,Delft.VINK, A. P. A., 1956: Applications of soil survey, 11. Agriculture Trans., VIth Int. Congr. Soil Sci., Paris,Vol. D, 639-64<strong>4.</strong>VINK, A. P. A., 1960: Quantitative aspects of land classification. Trans. VIIth. Int. Congress Soil Sci.,Vol. IV, 371-378.VINK, A. P. A., 1961 : De luchtfoto in verband met de landbouwkundige ontwikkeling van tropische ensubtropische gebieden. Tijdschrift Kon. Ned. Aardr. Gen. 78, 135-145.VINK, A. P. A., 1962: Practical soil surveys and their interpretation for practical purposes, 1.T.C.-Publication B 16, Delft.53