Columbia subject headings:
Antislavery movements--Spain--History--19th century--Congresses.
Slavery--Latin America--History--19th century--Congresses.
Slavery--Spain--History--19th century--Congresses.
Spain--Colonies--America--History--19th century--Congresses.
Harvard subject headings:
Antislavery movements--Spain--History--19th century--Congresses.
Slavery--Latin America--History--19th century--Congresses.
Slavery--Spain--History--19th century--Congresses.
Spain--Colonies--America--History--19th century--Congresses.
Princeton subject headings:
Black people--Social conditions--History--19th century--Congresses.
Human rights--History--19th century--Congresses.
Slaves--Emancipation--History--19th century--Congresses.