Columbia subject headings:
Marble sculpture, Classical.
Sculpture--Technique.
Harvard subject headings:
Marble sculpture, Classical--Conservation and restoration--History.
Marble sculpture, Classical.
Sculpture--Technique
Sculpture--Technique--History.
Princeton subject headings:
Ara Pacis (Rome, Italy)
Arch of Constantine (Rome, Italy)
Sculpture, Roman--Conservation and restoration--History.
Sculpture, Roman--Technique.