Columbia subject headings:
Africa, Southern--Economic conditions--Congresses.
Africa, Southern--Economic integration--Congresses.
Africa, Southern--Economic policy--Congresses.
Africa, Southern--Foreign economic relations--Congresses.
Economic assistance--Africa, Southern--Congresses.
Harvard subject headings:
Africa, Southern--Economic integration--Congresses.
Africa, Southern--Economic policy--Congresses.
Economic assistance--Africa, Southern--Congresses.
Princeton subject headings:
Africa, Southern--Economic conditions--Congresses.
Africa, Southern--Foreign economic relations--Congresses.