Columbia subject headings:
Ethiopia--History.
Ethiopia--Politics and government--1889-1974.
Ethiopia--Politics and government--1974-1991.
Harvard subject headings:
Ethiopia--Foreign relations--Soviet Union.
Ethiopia--History--1974-1995
Soviet Union--Foreign relations--Ethiopia.
Princeton subject headings:
Ethiopia--History.
Ethiopia--Politics and government--1889-1974.
Ethiopia--Politics and government--1974-1991.