Columbia subject headings:
Popes--Portraits.
Rome--Statues.
Sculpture, Italian.
Sculpture, Renaissance--Italy.
Statues--Italy--Bologna.
Statues--Italy--Perugia.
Harvard subject headings:
Popes--Portraits.
Sculpture, Italian.
Sculpture, Renaissance--Italy.
Statues--Italy--Bologna.
Statues--Italy--Perugia.
Statues--Italy--Rome.
Princeton subject headings:
Popes--Portraits.
Sculpture, Italian.
Sculpture, Renaissance--Italy.
Statues--Italy.