Columbia subject headings:
Ethiopia--Economic conditions--Congresses.
Ethiopia--History--1889-1974--Congresses.
Ethiopia--Politics and government--1889-1974--Congresses.
Ethiopia--Social conditions--Congresses.
Harvard subject headings:
Ethiopia--Economic conditions--Congresses.
Ethiopia--History--1889-1974--Congresses.
Ethiopia--Politics and government--1889-1974--Congresses.
Ethiopia--Social conditions--Congresses.
Princeton subject headings:
Ethiopia--Economic conditions--Congresses.
Ethiopia--History--1889-1974--Congresses.
Ethiopia--Politics and government--1889-1974--Congresses.
Ethiopia--Social conditions--Congresses.