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Item Methods of data analysis for intercropping systems under rubber(Rubber Research Institute. Agalawatta, 2001) Wijesuriya, W.; Thattil, R.O.Item Selection criteria used in clonal evaluation of sugarcane (Saccharum spp.)(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1993) Wijesuriya, A.; Thattil, R.O.; Perera, A.L.T.Item Indices for measuring performance of smallholder rubber units(National Science Foundation:Colombo, 2007-6) Wijesuriya, W.; Thattil, R.O.; Samitha, S.