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Petroleum industry and trade --- Petroleum industry and trade. --- Aardolie. --- Economische aspecten. --- Organization of Petroleum Exporting Countries --- Organization of Petroleum Exporting Countries. --- Industrial economics --- Foreign trade policy --- Relation between energy and economics --- Petroleum technology. Petrochemistry --- Organization of the Petroleum Exporting Countries --- Organisatie der petroleum-exporterende landen. (Tijdschrift) --- Pétrole.Commerce. (Revue) --- Organisation des pays exportateurs de pétrole. (Revue) --- Petroleumhandel. (Tijdschrift) --- Pétrole --- Periodicals --- Industrie et commerce --- Périodiques --- Periodicals.