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Organization of Petroleum Exporting Countries (OPEC), 1973 -- North America, United States, Algeria, Libya, Nigeria, Gabon, Venezuela, Ecuador, Saudi Arabia, Iraq, Iran, Kuwait, Qatar, Abu Dhabi(U.A.E.), Indonesia Map.
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The role of the iron, copper, lead, and petroleum export sectors in the economic development of Brazil, Chile, Mexico, and Venezuela : an empirical macroeconomic analysis
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