00369nam a2200133 a 450000500170000010000190001724500400003626000410007630000210011796400160013899700120015499900170016695200520018320251203092335.0  aDixon, John A.  aThe Economics of Dryland Management  aLondonbEarthscan Publicationsc1989  axviii, 302p.cPB  bcdefg_  a58608 C  c72734d72734  00104070aPUbPUd2001-06-20l0o p58608yBK