Columbia subject headings:
Harvard subject headings:
Agriculture and state--United States--Congresses.
Farms--Government policy--United States--Congresses.
Land use, Rural--Government policy--United States--Congresses.
Soil conservation--Government policy--United States--Congresses.
Princeton subject headings:
Agriculture and state--United States--Congresses.
Farms--Government policy--United States--Congresses.
Land use, Rural--Government policy--United States--Congresses.
Soil conservation--Government policy--United States--Congresses.