Columbia subject headings:
Harvard subject headings:
Diplomats--Germany--Prussia--Biography.
Friedrich Wilhelm, Elector of Brandenburg, 1620-1688
Prussia (Germany)--History--1640-1740.
Schwerin, Otto, Freiherr von, 1616-1679.
Princeton subject headings:
Diplomats--Germany--Prussia--Biography.
Friedrich Wilhelm, Elector of Brandenburg, 1620-1688.
Prussia (Germany)--History--1640-1740.
Schwerin, Otto, Freiherr von, 1616-1679.