Social and environmental aspects of desertification : proceedings of an Inter-Congress meeting of the.........Tuscon, Arizona, USA The United Nations University ; edited by J. A. Mabbutt and Andrew W.Wilson. The United Nations University. Mabbutt, J. A. jt. ed. Wilson, Andrew W. jt. ed. Desertification. 333.736 UNS Tokyo : United Nations University, 1980. 1980. 1980 Text iv, 40 p. : eng