Columbia subject headings:
Nigeria--Foreign relations--1960-1975.
Nigeria--Foreign relations--Soviet Union.
Nigeria--History--Civil War, 1967-1970.
Soviet Union--Foreign relations--Nigeria.
Harvard subject headings:
Nigeria--Foreign relations--1960-1975.
Nigeria--Foreign relations--Soviet Union.
Nigeria--History--Civil War, 1967-1970.
Soviet Union--Foreign relations--Nigeria.
Princeton subject headings: