Columbia subject headings:
Painting--Conservation and restoration.
Painting--Deterioration.
Painting--Effect of atmospheric ozone on.
Harvard subject headings:
Art--Conservation and restoration
Art--Deterioration.
Painting--Conservation and restoration
Painting--Deterioration.
Painting--Effect of atmospheric ozone on
Princeton subject headings:
Painting--Conservation and restoration.
Painting--Deterioration.
Painting--Effect of atmospheric ozone on.