| , 1981 , The Human Impact: Man's Role in Environmental Change, The MIT Press, Cambridge, Mass | , 1977 , Reclamation of the Sahara, Environmental Conservation, Vol |
|---|---|
| , 1949 , Climats, forests et desertification de l'Afrique tropicale, Societe d' Editions Geographiques, Maritimes et Coloniales, Paris | , Desertification: Process, Problems, Persprectives, pp |
| , Food, Fiber and the Arid Lands, pp | , 1977 , The Making of deserts: Climate, ecology and Society, Economic Geography, Vol |
|---|---|
| , 1964 , Operation Oryx: The second stage, Oryx, vol | 290—300, The University of Arizona Press, Tucson, Arizona |
307—337, Westview Press, Boulder, Colorado.
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