OCG 4113: Introduction to Upstream petroleum Industry http://ir.lib.ruh.ac.lk/handle/iruor/21108 2026-06-23T17:25:05Z 2026-06-23T17:25:05Z OCG 4113: Introduction to Upstream petroleum Industry Department of Oceanography and Marine Geology http://ir.lib.ruh.ac.lk/handle/iruor/21178 2026-06-16T04:30:32Z 2025-04-01T00:00:00Z OCG 4113: Introduction to Upstream petroleum Industry Department of Oceanography and Marine Geology 2025-04-01T00:00:00Z