Columbia subject headings:
Harvard subject headings:
Africa--Economic conditions--1960-
Africa--Politics and government--1960-
Africa--Social conditions--1960-
Nigeria--Economic conditions--1970-
Nigeria--Politics and government--1979-1983.
Nigeria--Politics and government--1984-1993.
Nigeria--Social conditions--1960-
Princeton subject headings:
Africa--Economic conditions--1960-
Africa--Politics and government--1960-
Africa--Social conditions--1960-
Nigeria--Economic conditions--1970-
Nigeria--Politics and government--1979-.
Nigeria--Social conditions--1960-