Columbia subject headings:
Art--Expertising--Congresses.
Art--Technique--Congresses.
Artists' preparatory studies--Congresses.
Infrared spectroscopy--Bibliography.
Painting--Radiography--Bibliography.
Harvard subject headings:
Artists' preparatory studies--Congresses.
Drawing--Expertising--Congresses.
Infrared radiation--Congresses.
Painting--Expertising--Congresses.
Princeton subject headings: