Columbia subject headings:
Harvard subject headings:
Frederick II, King of Prussia, 1712-1786.
Frederick William I, King of Prussia, 1688-1740.
Princeton subject headings:
Frederick II, King of Prussia, 1712-1786.
Frederick William I, King of Prussia, 1688-1740.
Prussia (Germany)--History--Frederick II, 1740-1786--Sources.
Prussia (Germany)--History--Frederick William I, 1713-1740--Sources.