Columbia subject headings:
Denmark--Foreign relations--1660-1814.
Denmark--Foreign relations--Germany--Prussia.
Prussia (Germany)--Foreign relations--1688-1713.
Prussia (Germany)--Foreign relations--18th century.
Prussia (Germany)--Foreign relations--Denmark.
Harvard subject headings:
Denmark--Foreign relations--1660-1814.
Denmark--Foreign relations--Germany--Prussia.
Prussia (Germany)--Foreign relations--1688-1713.
Prussia (Germany)--Foreign relations--18th century.
Prussia (Germany)--Foreign relations--Denmark.
Princeton subject headings:
Denmark--Foreign relations--Prussia (Germany).
Prussia (Germany)--Foreign relations--18th century.
Prussia (Germany)--Foreign relations--Denmark.