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