Columbia subject headings:
Europe--History--18th century.
Prussia (Germany)--History--Frederick II, 1740-1786.
Prussia (Germany)--History--Frederick William I, 1713-1740.
Harvard subject headings:
Europe--History--18th century.
Prussia (Germany)--History--Frederick II, 1740-1786.
Prussia (Germany)--History--Frederick William I, 1713-1740.
Princeton subject headings: