Gunathilaka, H.A.J.Liyanage, M de S.2014-06-032014-06-031994Proceedings of the seminar/workshop, Sri Lanka. Forestry Unit,University of Sri Jayawardenepura, Gangodawila, Nugegoda, 1994:p...https://dl-cri.nsf.gov.lk//handle/1/3550Farming SystemsCropping systems