na INLIS000000000004963 Ind 0010-1118004963 Modelling the economics of Imperata control in smallholder rubber plantations GRIST, Peter Peter Grist; and Ken Menz Canberra ACIAR 1995 13 p.: ill.; 30 cm 13 p.: ill.; 30 cm Improving smallholder farming systems in imperata areas of smallholder Asia 633.91-2 WEED CONTROL FARMING SYSTEMS RUBBER SOUTHEAST ASIA 7272/1996 (4068)