Columbia subject headings:
Land use--Government policy--Developing countries.
Soil conservation--Government policy--Developing countries.
Soil erosion--Developing countries.
Harvard subject headings:
Land use--Government policy--Developing countries.
Soil conservation--Government policy--Developing countries.
Soil erosion--Developing countries.
Princeton subject headings:
Land use--Government policy--Developing countries.
Soil conservation--Government policy--Developing countries.
Soil erosion--Developing countries.