Columbia subject headings:
Africa--Economic conditions--1960---Congresses.
Africa--Politics and government--1960---Congresses.
Africa--Social conditions--1960---Congresses.
Economic forecasting--Africa--Congresses.
Harvard subject headings:
Africa--Economic conditions--1960---Congresses.
Africa--Politics and government--1960---Congresses.
Africa--Social conditions--1960---Congresses.
Economic forecasting--Africa--Congresses.
Princeton subject headings: