Columbia subject headings:
Cities and towns--Germany, Northern--History--Congresses.
Sweden--History--17th century--Congresses.
Harvard subject headings:
Cities and towns--Germany, Northern--History--Congresses.
Sweden--History--17th century--Congresses.
Princeton subject headings:
Germany--Foreign relations--Sweden--Congresses.
Stade (Lower Saxony, Germany)--History--Congresses.
Sweden--Foreign relations--Germany--Congresses.
Sweden--History--1523-1718--Congresses.