Columbia subject headings:
Harvard subject headings:
Africa, Southern--Economic integration
Africa, Southern--Emigration and immigration.
Africa, West--Economic integration
Africa, West--Emigration and immigration.
Regionalism--Africa, Southern.
Regionalism--Africa, West.
Princeton subject headings:
Africa, Southern--Economic integration.
Africa, Southern--Emigration and immigration.
Africa, West--Economic integration.
Africa, West--Emigration and immigration.
Regionalism--Africa, Southern.
Regionalism--Africa, West.