Columbia subject headings:
Cities and towns--Europe, Central--History--17th century--Congresses.
Cities and towns--Europe, Central--History--18th century--Congresses.
Harvard subject headings:
Cities and towns--Europe, Central--History--17th century--Congresses.
Cities and towns--Europe, Central--History--18th century--Congresses.
Cities and towns--Europe, Central--History.
Princeton subject headings:
Cities and towns--Europe, Central--History--17th century--Congresses.
Cities and towns--Europe, Central--History--18th century--Congresses.