Columbia subject headings:
Harvard subject headings:
Africa, North--History--1517-1882.
Pirates--Africa, North--History.
Ransom--Africa, North--History.
Ransom--Spain--History.
Slavery--Africa, North--History.
Spain--History--House of Austria, 1516-1700.
Spaniards--Africa, North--History.
Princeton subject headings:
Africa, North--History--1517-1882.
Pirates--Africa, North--History.
Ransom--Africa, North--History.
Ransom--Spain--History.
Slavery--Africa, North--History.
Spain--History--1516-1700.
Spaniards--Africa, North--History.