Columbia subject headings:
Congo (Democratic Republic)--Colonization.
Congo (Democratic Republic)--History--To 1908.
Harvard subject headings:
Belgium--Colonies--Africa.
Belgium--Colonies--History.
Belgium--History--Leopold II, 1865-1909.
Congo (Democratic Republic)--Colonization.
Congo (Democratic Republic)--History--To 1908
Congo (Democratic Republic)--Politics and government--1885-1908
Rubber industry and trade--Congo (Democratic Republic)--History.
Princeton subject headings:
Congo (Democratic Republic)--Colonization.
Congo (Democratic Republic)--History--To 1908.
Congo (Democratic Republic)--Politics and government--1885-1908.