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Arid lands : Economic, social and ecological monitoring ; report of a workshop held at the Institute of Development Studies, 28.-29.6.1976
Hopcraft, Peter N., (1977)
The Savanna Research Institute "S.R.I." in the Democratic Republic of the Sudan : a case study ; the National Council for Research
El Sammani, Abdalla Yacoub, (1972)
Land use on the arid margin of the clays in the Blue Nile and Kassala provinces
Randell, John R., (1963)
Aid and sustainable development in a dual economy
Haaland, Gunnar, (1990)
Economic determinants in Ethnic processes
Haaland, Gunnar, (1969)
Økonomisk vekst og sosial forandring : noen sosialantropologiske synspunkter
Haaland, Gunnar, (1964)