Social and environmental aspects of desertification : proceedings of an Inter-Congress Meeting of the International Geographical Union Working Group on Desertification In and Around Arid Lands, held in conjunction with the Arid Lands sub-programme of the United Nations University natural resources programme, and the UNESCO/MAB programme, 3-8 January 1979, Tucson, Arizona, USA / edited by J.A. Mabbutt and Andrew W. Wilson

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