Columbia subject headings:
Cities and towns, Medieval--History--Congresses.
Cities and towns, Renaissance--Europe--History--Congresses.
State, The--History--Congresses.
Harvard subject headings:
Cities and towns, Medieval--Europe--History--Congresses.
Cities and towns, Renaissance--Europe--History--Congresses.
State, The--History--Congresses.
Princeton subject headings:
Cities and towns, Medieval--Europe--History--Congresses.
Cities and towns, Renaissance--Europe--History--Congresses.
State, The--History--Congresses.