Columbia subject headings:
Africa, West--Economic conditions.
Africa, West--History.
Agriculture--Economic aspects--Africa, West.
Livestock--Africa, West.
Savannas--Africa, West.
Harvard subject headings:
Africa, West--Economic conditions.
Africa, West--History.
Agriculture--Africa, West--History.
Agriculture--Economic aspects--Africa, West--History.
Livestock--Africa, West--History.
Savannas--Africa, West--History.
Princeton subject headings: