00690nam a2200205Ia 4500001001100000005001700011008004100028020001500069043001200084050002000096245008900116260004200205300003700247504005700284650002600341650003500367650001700402650002600419830003900445000000054120251012174406.0  970409s1997    dcuab    b    000 0 eng  a0821339443  aw------00aS481b.W35 199710aIntensified systems of farming in the tropics and subtropicscJ.A. Nicholas Wallis.   aWashington, D.C.bWorld Bankcc1997.   axiii, 203 p.bill., mapsc28 cm.  aIncludes bibliographical references (p. [167]-195).  0aAgricultural systems. 0aAgricultural systemszTropics. 0aDry farming. 0aDry farmingzTropics. 0aWorld Bank discussion papersv364.