00312    a2200109   4500020001500000082001500015100001800030245004600048260005300094300002000147650003500167  a052163511X  a338.1bUPT  aUpton, Martin  aThe Economics of tropical farming systems  aNew YorkbCambridge University Pressc1996g1996  a[x],374p.c22cm  aAgriculture - economic aspects