Columbia subject headings:
Slavery--Portugal--History.
Slavery--Spain--History.
Harvard subject headings:
Black people--Portugal--History.
Black people--Spain--History.
Muslims--Portugal--History.
Muslims--Spain--History
Slavery--Portugal--History.
Slavery--Spain--History.
Slaves--Portugal--History.
Slaves--Spain--History.
Princeton subject headings:
Black people--Portugal--History.
Black people--Spain--History.
Muslims--Portugal--History.
Muslims--Spain--History.
Slavery--Portugal--History.
Slavery--Spain--History.
Slaves--Portugal--History.
Slaves--Spain--History.