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Petroleum industry and trade --- History. --- AA / International- internationaal --- OPC / Opec - Opep --- 338.731 --- 331.30 --- 338.012 --- Aardolie. Aardolieschok. --- Economische toestand. --- Energie (productiefactor). --- History --- Economische toestand --- Aardolie. Aardolieschok --- Organization of Petroleum Exporting Countries --- Munazẓamat al-Buldān al-Muṣaddirah li-Nafṭ --- O.P.E.C. --- O.P.E.P. --- OPEC --- OPEK --- OPEP --- Organisation of Petroleum Exporting Countries --- Organización de Países Exportadores de Petróleo --- Organizația Țărilor Exportatoare de Petrol --- Organization of the Petroleum Exporting Countries --- Sekiyu Yushutsukoku Kikō --- Ūbbik --- Ūpik --- Sāzmān-i Kishvarʹhā-yi Ṣādirʹkunandah-yi Naft --- אופ׳ק --- منظمة البلدان المصدرة للبترول --- منظمة البلدان المصدرة للنفط --- اوبك --- اوپك --- سازمان کشورهاى صادرکنندهى نفت --- Energie (productiefactor) --- OPEC (Organization of the Petroleum Exporting Countries) --- سازمان کشور‌هاى صادرکننده‌ى نفت