Columbia subject headings:
Antiquities--Collection and preservation--Congresses.
Architecture--Conservation and restoration--Congresses.
Art objects--Conservation and restoration--Congresses.
Art--Conservation and restoration--Congresses.
Harvard subject headings:
Antiquities--Collection and preservation--Congresses
Architecture--Conservation and restoration--Congresses
Art objects--Conservation and restoration--Congresses.
Art--Conservation and restoration--Congresses.
Princeton subject headings: