Columbia subject headings:
Persian Gulf Region--Foreign relations--United States.
Persian Gulf Region--Politics and government.
United States--Foreign relations--Persian Gulf Region.
Harvard subject headings:
Persian Gulf Region--Foreign relations--United States.
Persian Gulf Region--Politics and government.
United States--Foreign relations--Persian Gulf Region.
Princeton subject headings:
Persian Gulf Region--Foreign relations--United States.
Persian Gulf Region--Politics and government.
United States--Foreign relations--Persian Gulf Region.