Columbia subject headings:
Painting--Conservation and restoration--Congresses.
Painting--Expertising--Congresses.
Painting--Technique--Congresses.
Harvard subject headings:
Painting--Conservation and restoration--Congresses.
Painting--Expertising--Congresses.
Painting--Technique--Congresses.
Princeton subject headings:
Painting--Conservation and restoration--Congresses.
Painting--Expertising--Congresses.
Painting--Technique--Congresses.