1993. 2011-09-13T18:11:20Z. 2020-08-14T18:08:28Z. Oman. Mudīrīyah al-ʻĀmmah lil-Maʻādin. Sultanate of Oman, Ministry of Petroleum and Minerals, Directorate General of Minerals. English. Public. Oman.
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1993. 2011-09-13T18:02:01Z. 2021-08-31T19:45:36Z. Oman. Mudīrīyah al-ʻĀmmah lil-Maʻādin. Sultanate of Oman, Ministry of Petroleum and Minerals, Directorate General of Minerals. English. Public. Oman.