Columbia subject headings:
Harvard subject headings:
Africa--Economic conditions.
Africa--Emigration and immigration--Economic aspects.
Economic development--Africa.
Europe--Emigration and immigration.
Migration, Internal--Africa.
Return migration--Africa.
Princeton subject headings:
Africa--Economic conditions.
Africa--Emigration and immigration--Economic aspects.
Economic development--Africa.
Europe--Emigration and immigration.
Migration, Internal--Africa.
Return migration--Africa.