Annual report - Organization of the Petroleum Exporting Countries.
Organization of Petroleum Exporting Countries.
Organization of Petroleum Exporting Countries.OPEC annual report.
Vienna [Public Relations & Information Dept., Organization of the Petroleum Exporting Countries, etc.]
Issued by various departments of the Organization of the Petroleum Exporting Countries.
Organization of Petroleum Exporting Countries
Organization of Petroleum Exporting Countries.
Organization of Petroleum Exporting Countries
Petroleum industry and trade
Petroleum industry and trade.