Columbia subject headings:
Africa, West--Economic integration--Congresses.
Africa, West--Foreign economic relations--Nigeria--Congresses.
Economic Community of West African States--Congresses.
Nigeria--Economic policy--Congresses.
Nigeria--Foreign economic relations--Africa, West--Congresses.
Harvard subject headings:
Africa, West--Commerce--Nigeria--Congresses.
Africa, West--Economic integration--Congresses.
Nigeria--Commerce--Africa, West--Congresses.
Princeton subject headings:
Africa, West--Commerce--Nigeria--Congresses.
Africa, West--Economic integration--Congresses.
Nigeria--Commerce--Africa, West--Congresses.