00378nam a2200145Ia 4500080000500000100001800005245010500023260002800128300001000156500001500166650001800181650001500199010000900214010000900223 a aLane, Charles aBarabaig natural resource management: sustainable land use under threat of destruction/ Charles Lane aGenebra:bUNRISD,c1990 a22 p. aexemplares aAgrícultura aPastoricia atrue atrue