00407nam a22001337a 4500008004100000020001800041040005500059080002200114100002000136245005800156260003200214300001500246650001200261230427b        |||||||| |||| 00| 0 eng d  a0-415-00457-8  aNational Science LibrarycNational Science Library  a502.3:631.61 bM9  aBeaumont, Peter  aEnvironmental management and development in drylands   aLondon: bRoutledge, c1989  axix, 505p.  aScience