Columbia subject headings:
Ceramic sculpture--Conservation and restoration.
Robbia family.
Harvard subject headings:
Robbia family--Congresses.
Terra-cotta sculpture, Italian--Conservation and restoration--Congresses.
Terra-cotta sculpture--Technique--Congresses.
Princeton subject headings:
Robbia family--Congresses.
Terra-cotta sculpture, Italian--Conservation and restoration--Congresses.
Terra-cotta sculpture--Technique--Congresses.