Columbia subject headings:
Constable, John, 1776-1837--Criticism and interpretation.
Delacroix, Eugène, 1798-1863--Criticism and interpretation.
Menzel, Adolph, 1815-1905--Criticism and interpretation.
Oil sketches.
Painting.
Harvard subject headings:
Constable, John, 1776-1837--Notebooks, sketchbooks, etc.
Delacroix, Eugène, 1798-1863--Notebooks, sketchbooks, etc.
Menzel, Adolph, 1815-1905--Notebooks, sketchbooks, etc.
Oil sketches.
Princeton subject headings:
Constable, John, 1776-1837--Notebooks, sketchbooks, etc.
Delacroix, Eugène, 1798-1863--Notebooks, sketchbooks, etc.
Menzel, Adolph, 1815-1905--Notebooks, sketchbooks, etc.
Oil sketches.