Columbia subject headings:
Bologna (Italy)--History--To 1506.
Cities and towns, Medieval--Italy--Case studies.
City planning--Italy--Bologna.
Open spaces--Italy--Bologna.
Harvard subject headings:
Bologna (Italy)--History--To 1506
Cities and towns, Medieval--Italy--Case studies.
City planning--Italy--Bologna
Open spaces--Italy--Bologna.
Princeton subject headings:
Bologna (Italy)--History--To 1506.
Cities and towns, Medieval--Italy.