Columbia subject headings:
Antiquities--Collection and preservation--Congresses.
Art--Conservation and restoration--Congresses.
Building materials--Analysis--Congresses.
Material culture--Collection and preservation--Congresses.
Materials--Analysis--Congresses.
Harvard subject headings:
Antiquities--Collection and preservation--Congresses
Art--Conservation and restoration--Congresses.
Art--Dating--Congresses.
Art--Expertising--Congresses.
Materials--Analysis--Congresses.
Princeton subject headings: