Columbia subject headings:
Bologna (Italy)--Buildings, structures, etc.
Church architecture--Italy--Bologna.
San Pietro (Church : Bologna, Italy)
Harvard subject headings:
Bologna (Italy)--Buildings, structures, etc.
Chiesa cattedrale e metropolitana di San Pietro (Bologna, Italy)
Church architecture--Italy--Bologna.
Church decoration and ornament--Italy--Bologna.
Princeton subject headings:
Chiesa cattedrale e metropolitana di San Pietro (Bologna, Italy)
Church architecture--Italy--Bologna.
Church decoration and ornament--Italy--Bologna.