Columbia subject headings:
Harvard subject headings:
Africa--Colonization--History--19th century--Congresses.
America--Colonization--History--19th century--Congresses.
Europe--Colonies--Africa--History--19th century--Congresses.
Europe--Colonies--America--History--19th century--Congresses.
Slavery--History--19th century--Congresses.
Princeton subject headings:
Africa--Colonization--History--19th century--Congresses.
America--Colonization--History--19th century--Congresses.
Europe--Colonies--Africa--History--19th century--Congresses.
Europe--Colonies--America--History--19th century--Congresses.
Slavery--History--19th century--Congresses.