Columbia subject headings:
Petroleum industry and trade--Persian Gulf Region.
Harvard subject headings:
Persian Gulf Region--Economic conditions--Congresses.
Persian Gulf Region--Economic policy--Congresses.
Persian Gulf Region--Social conditions--Congresses.
Petroleum industry and trade--Social aspects--Persian Gulf Region--Congresses.
Princeton subject headings:
Persian Gulf Region--Economic conditions.
Petroleum industry and trade--Persian Gulf Region.