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15:19 GMT +3 hours29 January 2015
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OPEC: history, structure, functions

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OPEC: history, structure, functions
OPEC, the Organization of the Petroleum Exporting Countries, id an international organization uniting most of the world's petroleum exporting countries

OPEC, the Organization of the Petroleum Exporting Countries, id an international organization uniting most of the world's petroleum exporting countries