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Gal Oya water management project : mid-term impact assessment
(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1985) Widanapathirana, A.S.; Brewer, J.B.; Agrarian Research and Training Institute
Pre-rehabilitation situation of the Gal Oya scheme:analysis of socio-economic characteritics
(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1986) Widanapathirana, A.S.; Hector Kobbekaduwa Agrarain Research and Training Institute