Columbia subject headings:
Economic sanctions--Iran.
Economic sanctions--Libya.
Iran--Foreign economic relations--United States.
United States--Foreign economic relations--Iran.
Harvard subject headings:
Economic sanctions--Iran.
Economic sanctions--Libya.
Iran--Foreign economic relations--United States.
United States--Foreign economic relations--Iran.
Princeton subject headings:
Economic sanctions--Iran.
Economic sanctions--Libya.
Iran--Foreign economic relations--United States.
United States--Foreign economic relations--Iran.