Columbia subject headings:
Cities and towns--Italy--Growth--History.
Italy--Civilization--1268-1559.
Italy--Civilization--476-1268.
Italy--Social conditions--1268-1559.
Social classes--Italy--History.
Harvard subject headings:
Cities and towns, Medieval--Italy
Italy--History--Germanic rule, 962-1268.
Italy--Social conditions.
Social ecology--Italy--History.
Sociology, Urban--Italy--History.
Princeton subject headings:
Cities and towns, Medieval--Italy.
Social ecology--Italy--History.
Sociology, Urban--Italy--History.