Columbia subject headings:
Africa--Economic conditions--1960---Econometric models.
Africa--Economic policy--Econometric models.
Africa--Social conditions--1960---Econometric models.
Harvard subject headings:
Africa--Economic conditions--1960---Econometric models.
Africa--Economic policy--Econometric models.
Africa--Social conditions--1960---Econometric models.
Princeton subject headings:
Africa--Economic conditions--1960---Econometric models.
Africa--Economic policy--Econometric models.
Africa--Social conditions--1960---Econometric models.