Columbia subject headings:
Cities and towns, Medieval--Europe.
Cities and towns--Europe--History.
Cities and towns--Germany--History.
Germany--Social conditions--Congresses.
Harvard subject headings:
Cities and towns, Medieval--Europe.
Cities and towns--Europe--History
Cities and towns--Germany--History
Germany--Social conditions--Congresses.
Princeton subject headings:
Germany--Social conditions--Congresses.
Metropolitan areas--Germany--History--Congresses,.
Metropolitan areas--History--Congresses.