Columbia subject headings:
Export controls--United States.
Iran--Foreign economic relations--United States.
Syria--Foreign economic relations--United States.
United States--Foreign economic relations--Iran.
United States--Foreign economic relations--Syria.
Harvard subject headings:
Export controls--United States.
Iran--Foreign economic relations--United States.
Syria--Foreign economic relations--United States.
United States--Foreign economic relations--Iran.
United States--Foreign economic relations--Syria.
Princeton subject headings:
Export controls--United States.
Iran--Foreign economic relations--United States.
Syria--Foreign economic relations--United States.
United States--Foreign economic relations--Iran.
United States--Foreign economic relations--Syria.