Columbia subject headings:
Spain--History--Charles I, 1516-1556.
Spain--History--Philip II, 1556-1598.
Harvard subject headings:
Spain--History--Charles I, 1516-1556.
Spain--History--Philip II, 1556-1598.
Princeton subject headings:
Spain--History--Charles I, 1516-1556.
Spain--History--Philip II, 1556-1598.