na INLIS000000000002737 0010-0121001103 Modelling the economics of Imperata control in smallholder rubber plantations Peter Grist Canberra ACIAR 1995 13 p. : ill ; 30 cm 633.91-2 633.91-2 WEED CONTROL FARMING SYTEMS RUBBER SOUTHEAST ASIA ASIA TENGGARA KARET. 3866 3866