Columbia subject headings:
Belgians--Congo (Democratic Republic)--History--Congresses.
Belgium--Colonies--Congo (Democratic Republic)--History--Congresses.
Congo (Democratic Republic)--Colonization--History--Congresses.
Congo (Democratic Republic)--History--1908-1960--Congresses.
Congo (Democratic Republic)--History--To 1908--Congresses.
Harvard subject headings:
Congo (Democratic Republic)--History
Princeton subject headings: