Columbia subject headings:
Europe, Eastern--Commerce--Nigeria--Congresses.
Europe, Eastern--Foreign economic relations--Nigeria--Congresses.
Nigeria--Commerce--Europe, Eastern--Congresses.
Nigeria--Foreign economic relations--Europe, Eastern--Congresses.
Harvard subject headings:
Europe, Eastern--Foreign economic relations--Nigeria--Congresses.
Nigeria--Foreign economic relations--Europe, Eastern--Congresses.
Princeton subject headings:
Europe, Eastern--Foreign economic relations--Nigeria--Congresses.
Nigeria--Foreign economic relations--Europe, Eastern--Congresses.