References
- Marbut, C.F., 1924, Soils: Their Genesis and Classification (Madison WI: Soil Science Society of America, 1951). Lecture notes.
- Dokuchaev, V.V., 1880, Protocol of the meeting of the branch of geology and mineralogy of the St Petersburg Society of Naturalists. Transactions of the St Petersburg Society of Naturalists XII, 65–97. Russian.
- Hobsbawm, E., 1994, Age of Extremes. The Short Twentieth Century 1914-1991 (London: Michael Joseph).
- Glinka, K.D., 1914, Die typen der bodenbildung – Ihre klassification und geograsphsiche verbreitung: Treatise on soil science (Berlin: Verlag von Gebrüder Borntreiger).
- Marbut, C.E., 1935, Soils of the United States. In: O.E. Baker (Ed.), Atlas of American Agriculture, (Washington DC:US Dept Agriculture, Bureau of Chemistry and Soils), 1–98.
- Kellogg, C.E., 1937, Soil Survey Manual (Washington DC: USDA). Misc. Pub. 274.
- Norton, E.A., 1939, Soil Conservation Survey Handbook (Washington DC: USDA). Misc. Pub. 352.
- Jenny, H., 1941, Factors of Soil Formation – A System of Quantitative Pedology (New York: McGraw Hill).
- Klingebiel, A.A. and Montgomery, P.H.G., 1961, Land Capability Classification (Washington DC: USDA). Hbk 210.
- Hockensmith, R.D. and Steele, J.G., 1949, Recent trends in the use of land capability classification. Proceedings of the Soil Science Society of America 14(C), 383–388. doi: 10.2136/sssaj1950.036159950014000C0091x.
- Soil Survey Staff, 1960, Soil Classification. A Comprehensive System, 7th Approximation Ultimately: 1975, Soil taxonomy A basic system of soil classification for making and interpreting soil surveys. Agriculture Hbk 436, (Washington DC: USDA), (Washington DC: Soil Conservation Service, USDA).
- FAO-Unesco, 1974-8, Soil Map of the World, 1:5 000 000, Vols I-X, (Paris: Unesco).
- FAO, 1998, World reference base for soil resources. World Soil Resources Rept 84. (Rome: Food and Agriculture Organization of the United Nations).