Columbia subject headings:
Bologna (Italy)--Buildings, structures, etc.
City halls--Conservation and restoration--Italy--Bologna.
Palazzo comunale (Bologna, Italy)
Harvard subject headings:
Bologna (Italy)--Buildings, structures, etc.
City halls--Conservation and restoration--Italy--Bologna.
Palazzo comunale (Bologna, Italy)
Princeton subject headings:
Bologna (Italy)--Buildings, structures, etc.
City halls--Italy--Bologna.
Palazzo comunale (Bologna, Italy)
Public architecture--Conservation and restoration--Italy--Bologna.