Columbia subject headings:
Agriculture--Economic aspects--United States--Decision making--Mathematical models--Congresses.
Agriculture--Economic aspects--United States--Mathematical models--Congresses.
Harvard subject headings:
Agriculture--Economic aspects--United States--Decision making--Mathematical models--Congresses.
Agriculture--Economic aspects--United States--Mathematical models--Congresses.
Princeton subject headings:
Agriculture--Economic aspects--United States--Decision making--Mathematical models--Congresses.
Agriculture--Economic aspects--United States--Mathematical models--Congresses.