Columbia subject headings:
Slave trade--Puerto Rico--History--18th century.
Slave trade--Puerto Rico--History--19th century.
Slavery--Puerto Rico--History--18th century.
Slavery--Puerto Rico--History--19th century.
Harvard subject headings:
Slave trade--Puerto Rico--History--18th century.
Slave trade--Puerto Rico--History--19th century.
Slavery--Puerto Rico--History--18th century.
Slavery--Puerto Rico--History--19th century.
Princeton subject headings:
Slave trade--Puerto Rico--History--18th century.
Slave trade--Puerto Rico--History--19th century.
Slavery--Puerto Rico--History--18th century.
Slavery--Puerto Rico--History--19th century.