Categories Treaty Convention on the International Hydrographie Organisation اتفاقية المنظمة الهيدروغرافية الدولية Post author By admin Post date June 25, 1987 Download Ratified by Royal Decree 57/87. ← Agreement between the Government of the Sultanate of Oman and the Republic of Singapore for Air Services between and beyond Their Respective Territories → Office of Deputy Prime Minister for Finance and Economic Affairs: Ministerial Decision 26/87 Adding Some Clauses to Ministerial Decision 43/86