Columbia subject headings:
Africa--Emigration and immigration--Economic aspects.
Africans--Migrations--Economic aspects.
Immigrants--Economic conditions.
Immigrants--Social conditions.
Harvard subject headings:
Africa--Emigration and immigration--Economic aspects.
Africans--Migrations--Economic aspects.
Immigrants--Economic conditions.
Immigrants--Social conditions
Princeton subject headings:
Africa--Emigration and immigration--Economic aspects.
Africans--Migrations--Economic aspects.
Immigrants--Economic conditions.
Immigrants--Social conditions.
Social mobility--Africa.