Columbia subject headings:
Ferrucci, Francesco di Giovanni, 1497-1585--Criticism and interpretation.
Porphyry.
Sculpture, Italian--Italy--Florence.
Sculpture, Renaissance--Italy--Florence.
Steel--Heat treatment--Italy--Florence--History--16th century.
Harvard subject headings:
Princeton subject headings:
Art patronage--Italy--Florence.
Artists' tools.
Metallurgy--Italy--Florence--History.
Porphyry.
Sculpture--Italy--Florence.
Sculpture--Technique.
Stone carving--Technique.