Columbia subject headings:
Economic assistance, Domestic--United States.
Economic assistance.
Tariff--United States.
United States--Commercial treaties.
Harvard subject headings:
Economic assistance, Domestic--United States.
Import quotas.
Tariff--United States.
United States--Commercial treaties.
United States--Foreign economic relations.
Princeton subject headings:
Economic assistance, Domestic--United States.
Tariff--United States.
United States--Commercial treaties.