Columbia subject headings:
Harvard subject headings:
Philip IV, King of Spain, 1605-1665.
Spain--History--Philip III, 1598-1621.
Spain--History--Philip IV, 1621-1665.
Spain--Kings and rulers--Biography.
Princeton subject headings:
Philip IV, King of Spain, 1605-1665.
Spain--History--Philip III, 1598-1621.
Spain--History--Philip IV, 1621-1665.
Spain--Kings and rulers--Biography.