Columbia subject headings:
Ferreira, Joaquim Ferreira dos Santos, Conde de, 1782-1862.
Slave trade--Colonies--Portugal--History.
Slave traders--Portugal--Biography.
Slavery--Colonies--Portugal.
Harvard subject headings:
Ferreira, Joaquim Ferreira dos Santos, Conde de, 1782-1862.
Slave trade--Colonies--Portugal--History.
Slave trade--Portugal--Colonies--History.
Slave traders--Portugal--Biography.
Slavery--Colonies--Portugal.
Slavery--Portugal--Colonies.
Princeton subject headings:
Slave trade--Portugal--History--18th century.
Slave trade--Portugal--History--19th century.
Slave traders--Portugal--Biography.