Columbia subject headings:
Agricultural laws and legislation--United States.
Agricultural subsidies--United States.
Agriculture and state--United States.
Harvard subject headings:
Agricultural laws and legislation--United States.
Agricultural subsidies--United States.
Agriculture and state--United States.
Agriculture--Economic aspects--United States
Princeton subject headings:
Agricultural laws and legislation--United States.
Agriculture and state--United States.
Produce trade--Government policy--United States.