Columbia subject headings:
Foreign trade promotion--United States.
Non-tariff trade barriers.
Produce trade--United States.
Tariff on farm produce.
Harvard subject headings:
Foreign trade promotion--United States.
Non-tariff trade barriers.
Produce trade--United States
Tariff on farm produce.
United States--Commercial policy.
Princeton subject headings:
Foreign trade promotion--United States.
Non-tariff trade barriers.
Produce trade--United States.
Tariff on farm produce.
United States--Commercial policy.