Columbia subject headings:
Agriculture and state--United States--History--Congresses.
Agriculture--Economic aspects--United States--History--Congresses.
Harvard subject headings:
Agriculture and state--United States--History--Congresses.
Agriculture--Economic aspects--United States--History--Congresses.
Peterson, Trudy Huskamp, 1945-
Princeton subject headings:
Agriculture and state--United States--History--Congresses.
Agriculture--Economic aspects--United States--History--Congresses.