00803cas|a2200205 i 450000500170000000800410001703500150005805000150007324501080008826000270019630000540022349000400027765000340031770000210035170000250037271000110039771000410040871000410044981001070049020260817172244.0110600s1980    fr  r m rtt  00|  a1eng |  a.b1012972800aGB611bC3400aCase studies on desertification /cprepared by Unesco/UNEP/UNDP ; edited by J. A. Mabbutt and C. Floret  aParis :bUnesco,c1980  a279 p. : [8] folded leaves : maps (7 folded col.)1 aNatural resources research ;vv. 18 0aDesertificationxCase studies10aFloret, C.,eed.10aMabbutt, J. A.,eed.20aUnesco20aUnited Nations Environment Programme20aUnited Nations Development Programme2 aUnited Nations Educational, Scientific and Cultural Organization.tNatural resources research ;vv. 18