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Item Tea advertising : How effective is it?(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1998) Weerahewa, J.Item Trade competitiveness of agroforestry crop sector in Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2011) Thamiem, S.; Weerahewa, J.; Pushpakumara, D.K.N.G.; Singh, V.P.