Esther Bell. "Catalogue Raisonné of the Thaw Collection." Studying Nature: Oil Sketches from the Thaw Collection. New York, 2011, p. 117, no. 46, ill. (color), calls it "Plane Tree".
Ann Hoenigswald. "Manipulating Paint: The Shorthand of Plein-Air Technique." Studying Nature: Oil Sketches from the Thaw Collection. New York, 2011, p. 18, fig. 17 (color detail), describes techniques employed by the artist to produce specific effects.
Geneviève Lacambre. "Two Series of Studies in Oil on Paper Numbered by Pierre-Henri de Valenciennes and Simon Denis." Studying Nature: Oil Sketches from the Thaw Collection. New York, 2011, pp. 74, 83, no. 125, calls it "Trunk of a Plane Tree" and deduces that the number 125 on the verso situates it within the range of works similarly inscribed 78 through 127, whose primary motif is the earth with its vegetation.
