Courses by Open University of Sri Lanka / Courses in Sri Lanka / Online ApplicationsDiploma in Environmental Science 2018 / 2019 – Open University of Sri Lanka January 30, 2018 Closing Date – 2018-February-28 Advertisement English Edition Preview Download Advertisement (English Edition) Apply Online Instructions to Candidates Contact Numbers : 0112881364 / 0112881134 Source – Sunday Observer (2018.01.28) / Open University of Sri Lanka Official Website