Columbia subject headings:
Europe--History--17th century.
Thirty Years' War, 1618-1648--Finance.
Harvard subject headings:
Europe--History--17th century.
Niederrheinisch-Westfälischer Kreis--Economic conditions.
North Rhine-Westphalia (Germany)--Economic conditions.
Thirty Years' War, 1618-1648--Finance.
Princeton subject headings:
Niederrheinisch-Westfälischer Kreis--History--17th century.
Thirty Years' War, 1618-1648--Finance.