Columbia subject headings:
Economic assistance, Domestic--United States.
European Economic Community--United States.
Foreign trade promotion--United States.
Tariff--United States.
United States--Commercial treaties.
Harvard subject headings:
Economic assistance, Domestic--United States.
Tariff--United States.
United States--Commercial treaties.
Princeton subject headings:
Economic assistance, Domestic--United States.
Tariff--United States.
United States--Commercial treaties.