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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.
Maps.com, (1999)
Are petroleum exports an engine for growth? : Time-series evidence for five oil exporters
Roy, Atrayee Ghosh, (2001)
The economy of Latin America
Krause, Walter, (1966)