http://ir.lib.ruh.ac.lk/handle/iruor/7473 Wed, 13 May 2026 19:36:40 GMT 2026-05-13T19:36:40Z http://ir.lib.ruh.ac.lk/handle/iruor/13094 ශ්‍රී ලංකාව් වාරි ශිෂ්ටාචාරය සහ එල්ලංගා පද්ධති Amarasinghe, S.R.; Gunawardena, S.M. Fri, 01 Jan 2021 00:00:00 GMT http://ir.lib.ruh.ac.lk/handle/iruor/13094 2021-01-01T00:00:00Z http://ir.lib.ruh.ac.lk/handle/iruor/13092 Handbook for laboratory analysis of soil & water Amarasinghe, S.R. Wed, 01 Jan 2020 00:00:00 GMT http://ir.lib.ruh.ac.lk/handle/iruor/13092 2020-01-01T00:00:00Z http://ir.lib.ruh.ac.lk/handle/iruor/13091 "කොම්පෝස්ට්" compost Amarasinghe, S.R. Fri, 01 Jan 2021 00:00:00 GMT http://ir.lib.ruh.ac.lk/handle/iruor/13091 2021-01-01T00:00:00Z http://ir.lib.ruh.ac.lk/handle/iruor/13088 "අපූරු පා"ඩම" Amarasinghe, S.R. Sat, 01 Jan 2022 00:00:00 GMT http://ir.lib.ruh.ac.lk/handle/iruor/13088 2022-01-01T00:00:00Z