00313nam a22001217a 4500003000400000005001700004008004100021020001500062040000800077100001700085245004400102260004500146OSt20160506100858.0160506b        xxu||||| |||| 00| 0 eng d  a0521482895  cN/A  aUpton Martin  aThe economic of tropical farming system  aU.S.AbCambridge University Press c1996