Ganewatte, P. Thattumaru and Kattimaru systems of rotation of cultivation of paddy land A case study in the villages of Unduruwa Halmillaweva Anuradhapura District , Sri Lanka 1974 - Agrarian Research & Training Institute Colombo 1974 - 11p. table Nat. Bib. No.: 4011 Subjects--Topical Terms: Agriculture Universal Decimal Class. No.: 631.15 / GAN