Columbia subject headings:
Harvard subject headings:
Banks and banking--Spain--History.
Precious metals--America.
Spain--Colonies--America--Economic conditions.
Spain--History--Philip IV, 1621-1665.
Princeton subject headings:
Banks and banking--Spain--History--17th century.
Currency question--Spain--History--17th century.
Precious metals--America--History--17th century.
Precious metals--Spain--History--17th century.
Spain--History--Philip IV, 1621-1665.