Izumi, K.Ranatunga, A.S.Agrarian Research and Training Institute2014-07-182014-07-181973https://dl-harti.nsf.gov.lk//handle/1/2438x, 25p., 1 mapProduction CostsPaddySri LankaCost of production of paddy, Yala 1972:a study based on record keeping farmers in five selected districts