Columbia subject headings:
Petroleum industry and trade--Iran.
Petroleum industry and trade--Kuwait.
Petroleum industry and trade--Political aspects--Middle East.
Petroleum industry and trade--Saudi Arabia.
Harvard subject headings:
Petroleum industry and trade--Iran
Petroleum industry and trade--Kuwait.
Petroleum industry and trade--Political aspects--Middle East
Petroleum industry and trade--Saudi Arabia
Princeton subject headings:
Persian Gulf Region--Economic conditions.
Persian Gulf Region--Economic policy.
Petroleum industry and trade--Persian Gulf Region.