Columbia subject headings:
Harvard subject headings:
Middle East--Foreign relations--United States.
Persian Gulf Region--Foreign relations--United States.
United States--Foreign relations--Middle East.
United States--Foreign relations--Persian Gulf Region.
Princeton subject headings:
Middle East--Foreign relations--United States.
Persian Gulf Region--Foreign relations--United States.
United States--Foreign relations--Middle East.
United States--Foreign relations--Persian Gulf Region.