Columbia subject headings:
Agriculture--Economic aspects--Developing countries.
Agriculture--Economic aspects--History.
Developing countries--Population.
Population--History.
Harvard subject headings:
Agriculture--Economic aspects--Developing countries
Agriculture--Economic aspects--History.
Developing countries--Population.
Population--History
Princeton subject headings:
Agriculture--Economic aspects--Developing countries.
Agriculture--Economic aspects--History.
Developing countries--Population.
Population--History.