Columbia subject headings:
Communism--Ethiopia--History--20th century.
Ethiopia--History--Revolution, 1974--Causes.
Ethiopia--Politics and government--1889-1974.
Ethiopia--Politics and government--1974-1991.
Harvard subject headings:
Communism--Ethiopia--History--20th century.
Ethiopia--History--Revolution, 1974--Causes.
Ethiopia--Politics and government--1889-1974
Ethiopia--Politics and government--1974-1991
Princeton subject headings:
Communism--Ethiopia--History--20th century.
Ethiopia--History--Revolution, 1974--Causes.
Ethiopia--Politics and government--1889-1974.
Ethiopia--Politics and government--1974-1991.