Columbia subject headings:
Art--Conservation and restoration--Congresses.
Art--Technique--Congresses.
Paper--Preservation--Congresses.
Pigments--Preservation--Congresses.
Harvard subject headings:
Princeton subject headings:
Art--Conservation and restoration--Congresses.
Art--Technique--Congresses.
Paper--Preservation--Congresses.
Pigments--Preservation--Congresses.