na INLIS000000000018061 20210426130202 210426||||||||| | ||| |||| || | /3640 010-0421018061 id 631.58 631.58 WOR p WORKSHOP PROCEEDINGS ON CROPPING SYSTEM PROGRAMME PLANNING [1976: Sri lanka] Proceedings Of The Cropping Systems Workshop : Sri lanka - IDRC Cropping Systems Project Agricultural Research Centre Maha Illuppallama, Sri lanka, April, 20-21, 1976 Srilanka IDRC 1976 ii, 116p.:iii.; 30 cm Prosiding -- II. Judul -- Sistem usaha tani -- IDRC