Columbia subject headings:
Nigeria--Economic conditions--1970-
Nigeria--Politics and government--1984-1993.
Nigeria--Social conditions--1960-
Harvard subject headings:
Nigeria--Economic conditions--1970-
Nigeria--Politics and government--1984-1993.
Nigeria--Social conditions--1960-
Princeton subject headings:
Nigeria--Economic conditions--1970-
Nigeria--Politics and government--1984-1993.
Nigeria--Social conditions--1960-