Columbia subject headings:
Artists--France--History--19th century.
Landscape painting, French--19th century.
Painting--Technique--History--19th century.
Plein air painting--France.
Harvard subject headings:
Artists--France--History--19th century.
Landscape painting, French--19th century.
Painting--Technique--History--19th century.
Plein air painting--France.
Princeton subject headings:
Artists--France--History--19th century.
Landscape painting, French--19th century.
Painting--Technique--History--19th century.
Plein air painting--France.