Columbia subject headings:
Harvard subject headings:
Architecture--Italy--Bologna.
Columns--Italy--Bologna.
Piazza San Domenico (Bologna, Italy)
Sculpture, Italian--Italy--Bologna.
Statues--Italy--Bologna.
Princeton subject headings:
Architecture--Italy--Bologna.
Bologna (Italy)--Buildings, structures, etc.
Columns--Italy--Bologna.
Monuments--Italy--Bologna.
Piazza San Domenico (Bologna, Italy)
Sculpture, Italian--Italy--Bologna.
Statues--Italy--Bologna.