Columbia subject headings:
Painting, Modern--19th century--Conservation and restoration.
Painting, Modern--19th century--Technique.
Painting--Conservation and restoration--History--19th century.
Harvard subject headings:
Painting, Modern--19th century--Conservation and restoration.
Painting, Modern--19th century--Technique.
Painting--Conservation and restoration--History--19th century.
Princeton subject headings:
Painting, Modern--19th century--Conservation and restoration.
Painting, Modern--19th century--Technique.
Painting--Conservation and restoration--History--19th century.