Columbia subject headings:
Slavery--Spain--Extremadura--History--17th century.
Slaves--Spain--Extremadura--History--17th century.
Harvard subject headings:
Slave trade--Spain--Extremadura--History--17th century.
Slavery--Spain--Extremadura--History--17th century.
Slaves--Spain--Extremadura--History--17th century.
Princeton subject headings:
Slave trade--Spain--Estremadura--History--17th century.
Slavery--Spain--Estremadura--History--17th century.
Slaves--Spain--Estremadura--History--17th century.