Columbia subject headings:
Harvard subject headings:
Brandenburg (Germany : State)--Politics and government.
Friedrich Wilhelm, Elector of Brandenburg, 1620-1688
Prussia (Germany)--Foreign relations--Sweden.
Sweden--Foreign relations--Germany--Prussia.
Sweden--Politics and government--1632-1654.
Princeton subject headings:
Brandenburg (Electorate)--Foreign relations--Sweden.
Brandenburg (Electorate)--Politics and government.
Sweden--Foreign relations--Germany (East)--Brandenburg (Electorate).