biblio toscana

Études de cas sur la désertification

documents élaborés par l'Unesco, le PNUE et le PNUD

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