Columbia subject headings:
Africa, Eastern--Ethnic relations.
Africa, Eastern--Politics and government--1960-
Harvard subject headings:
Africa, Eastern--Ethnic relations--Congresses.
Africa, Eastern--Ethnic relations.
Africa, Eastern--Politics and government--1960-
Africa, Eastern--Politics and government--1960---Congresses.
Ethnicity--Africa, Eastern.
Princeton subject headings:
Africa, Eastern--Ethnic relations--Congresses.
Africa, Eastern--Politics and government--1960---Congresses.