Columbia subject headings:
Cities and towns, Medieval.
Cities and towns--Europe--History.
Sociology, Urban--Europe--History.
Harvard subject headings:
Cities and towns--Germany--History--Congresses.
Social structure--Germany--History--Congresses.
Sociology, Urban--Germany--History--Congresses.
Princeton subject headings:
Cities and towns--Germany--History--Congresses.
Social structure--Germany--History--Congresses.
Sociology, Urban--Germany--History--Congresses.