http://ir.lib.ruh.ac.lk/handle/iruor/7129 2026-04-05T23:11:30Z http://ir.lib.ruh.ac.lk/handle/iruor/19991 BST1162 - Introduction to Environmental Science Department of Biosystems Technology 2025-06-01T00:00:00Z http://ir.lib.ruh.ac.lk/handle/iruor/14211 BST1162 - Introduction to Environmental Science Department of Biosystems Technology 2023-07-01T00:00:00Z http://ir.lib.ruh.ac.lk/handle/iruor/1262 BST1162 - Introduction to Environmental Science Department of Biosystems Technology 2019-11-01T00:00:00Z