. "Organization of Petroleum Exporting Countries of OPEC" . . "Organization of Petroleum Exporting Countries (OPEC)" . . "Organisation of the Petroleum Exporting Countries" . . "OPEC members" . "Organization of Petroleum Exporting Countries" . . . "OPEC" . "oil-exporting countries" . . . . . . "OPEC governments" . "OPEC#OPEC+_members" . . . "Oil and Petroleum Exporting Countries" . "OPEC#1973\u20131974 oil embargo" . . . . "Mission to OPEC" . . "OPEC#Membership" . . . "state-owned by OPEC and Russia" . . . . "Founding member" . "oil suppliers" . . "OPEC" . "OPEC+" . . . . "Organization of the Petroleum Exporting Countries (OPEC)" . . . . "Organisation for Petroleum Exporting Countries" . . . "OPEC#1960\u20131975 founding and expansion" . . "the OPEC" . "Organisation of Petroleum exporting countries" . . "OPEC Fund" . . . "OPEC's" . "major oil-exporting country" . . . . "Organization of the Petroleum Exporting Countries" . . . . . . "Organisation of Petroleum Exporting Countries" . . . "Organization of Petroleum-Exporting Countries" . "oil producing states" .