Columbia subject headings:
Investments, Foreign--Nigeria--History.
Nigeria--Economic conditions--1960-
Petroleum industry and trade--Nigeria--History.
Harvard subject headings:
Investments, Foreign--Nigeria--History.
Nigeria--Economic conditions--1960-
Petroleum industry and trade--Nigeria--History.
Princeton subject headings:
Investments, Foreign--Nigeria--History.
Nigeria--Economic conditions--1960-
Petroleum industry and trade--Nigeria--History.