Columbia subject headings:
Harvard subject headings:
Africa--Colonization--Congresses.
Africa--History--1884-1960--Congresses.
Africa--Politics and government--To 1945--Congresses.
Colonies--Africa--Congresses.
Princeton subject headings:
Africa--Colonization--Congresses.
Africa--History--1884-1960--Congresses.
Africa--Politics and government--To 1945--Congresses.
Colonies--Africa--Congresses.
Portugal--Colonies--Africa--History--Congresses.