Columbia subject headings:
Persian Gulf Region--Economic conditions--Congresses.
Persian Gulf Region--Politics and government--Congresses.
Persian Gulf Region--Social conditions--Congresses.
Harvard subject headings:
Persian Gulf Region--Economic conditions--Congresses.
Persian Gulf Region--Politics and government--Congresses.
Persian Gulf Region--Social conditions--Congresses.
Princeton subject headings:
Persian Gulf Region--Economic conditions--Congresses.
Persian Gulf Region--Politics and government--Congresses.
Persian Gulf Region--Social conditions--Congresses.