Columbia subject headings:
Art--Protection--Congresses.
Cultural property--Protection--Congresses.
Outdoor sculpture--Conservation and restoration--Congresses.
Public art--Conservation and restoration--Congresses.
Public sculpture--Conservation and restoration--Congresses.
Harvard subject headings:
Princeton subject headings:
Cultural property--Protection--Congresses.
Outdoor sculpture--Conservation and restoration--Congresses.
Public art--Conservation and restoration--Congresses.
Public sculpture--Conservation and restoration--Congresses.