Columbia subject headings:
Slave trade--Political aspects--Cuba--History--19th century.
Slave trade--Political aspects--Great Britain--History--19th century.
Slave trade--Political aspects--Spain--History--19th century.
Harvard subject headings:
Great Britain--Relations--Spain.
Slave trade--Cuba--History--19th century.
Slave trade--Political aspects--Cuba--History--19th century.
Slave trade--Political aspects--Great Britain--History--19th century.
Slave trade--Political aspects--Spain--History--19th century.
Spain--Relations--Great Britain.
Princeton subject headings:
Slave trade--Cuba--History.
Slave trade--Great Britain--History.
Slave trade--Spain--History.
Slavery--History--19th century.