Columbia subject headings:
Democracy--Africa--Congresses.
Exports--Nigeria--Congresses.
Land tenure--Nigeria--Congresses.
Land use--Nigeria--Congresses.
Nigerian Export-Import Bank--Congresses.
Harvard subject headings:
Democracy--Africa--Congresses
Democracy--Nigeria--Congresses
Exports--Nigeria--Congresses.
Land tenure--Nigeria--Congresses.
Land use--Nigeria--Congresses.
Nigeria--Economic conditions--1970---Congresses.
Nigerian Export-Import Bank--Congresses.
Princeton subject headings: