Columbia subject headings:
Harvard subject headings:
Agriculture and state--United States.
Agriculture--Economic aspects--United States
China--Foreign economic relations--United States.
European Union countries--Foreign economic relations--United States.
Foreign trade promotion--United States.
Produce trade--Government policy--United States
United States--Foreign economic relations--China.
United States--Foreign economic relations--European Union countries.
Princeton subject headings:
Agriculture and state--United States.
Agriculture--Economic aspects--United States.
China--Foreign economic relations--United States.
European Union countries--Foreign economic relations--United States.
Foreign trade promotion--United States.
Produce trade--Government policy--United States.
United States--Foreign economic relations--China.
United States--Foreign economic relations--European Union countries.