Columbia subject headings:
Exports--United States.
Non-tariff trade barriers.
Produce trade--Government policy--China.
Produce trade--Government policy--United States.
Harvard subject headings:
Exports--United States
Non-tariff trade barriers.
Produce trade--Government policy--China.
Produce trade--Government policy--United States
Princeton subject headings:
Exports--United States.
Non-tariff trade barriers.
Produce trade--Government policy--China.
Produce trade--Government policy--United States.