Geneviève Lacambre in Pierre-Henri de Valenciennes 1750–1819. Exh. cat., Palazzo Racani Arroni, Spoleto. Naples, 1996, p. 133, states that, according to the posthumous inventory of Valenciennes's atelier, the artist's studies were kept in a single folder, but that they were subsequently divided, including a group of nine that the artist's nephew [Achille Valenciennes] purchased for the relatively high sum of 405 francs, suggesting that these might be identical with MMA 2009.400.111–19.
Bruno Mantura in Pierre-Henri de Valenciennes 1750–1819. Exh. cat., Palazzo Racani Arroni, Spoleto. Naples, 1996, pp. 52, 133, no. 3, ill. (color and black and white), states that, as the sketch bears no inscription, the title is descriptive; notes that it is one of eight previously unexhibited, unpublished oil sketches by Valenciennes which were recently on the Paris art market together with a ninth example [now MMA 2009.400.111–119], and that these are probably identical with the group of nine such works included in the artist's posthumous sale, held in Paris on April 26, 1819, where they were purchased by his nephew Achille Valenciennes;.
Christopher Riopelle in A Brush with Nature: The Gere Collection of Landscape Oil Sketches. Exh. cat., National Gallery. London, 1999, p. 166 under no. 67, states that this is one of eight works included in Exh. Spoleto 1996 [MMA 2009.400.111–112 and 2009.400.114–119] as works by Valenciennes which were, rather, painted by George Augustus Wallis (Scottish, 1761–1847) during the latter's Italian sojourn of 1788–1806.
Anna Ottani Cavina. Paysages d'Italie: Les peintres du plein air (1780–1830). Exh. cat., Galeries Nationales du Grand Palais. Paris, 2001, p. 95 under no. 61, attributes MMA 2009.400.111–112 and 2009.400.114–119 to Wallis; infers that they were attributed to Wallis by James Mackinnon on the basis of his own research (in "Aspects of Landscape 1760–1880," exh. cat., W. M. Brady & Co., New York, 1996, unpaginated, under nos. 6–7; see also nos. 8–9); infers that John Lishawa singled them out from among all the works included in Exh. Spoleto 1996 to serve as the basis for assigning previously unattributed works to Wallis (see "George Augustus Wallis, 1761–1847," exh. cat., Galerie Eric Coatalem, Paris, 1998, p. 8); notes that [Ref. Riopelle 1999] also attributes them to Wallis.
William M. Griswold and Cara D. Denison in The Thaw Collection: Master Drawings and Oil Sketches, Acquisitions Since 1994. Exh. cat., Pierpont Morgan Library. New York, 2002, pp. 156, 158 under nos. 70–71, call it a work by Valenciennes but also state that "further study is needed"; summarize arguments for the attribution of the nine MMA oil sketches (2009.400.111–119) as set forth in Refs. Lacambre 1999, Riopelle 1999, and Cavina 2001; consider all nine to be by the same hand but question whether the same artist also executed the sketches exhibited by Mackinnon and Coatalem and attributed by them to Wallis [see Ref. Cavina 2001].
Geneviève Lacambre. "Introduction." Pierre-Henri de Valenciennes, 1750–1819: Actes du colloque du 28 mai 2003. Portet-sur-Garonne, 2005, pp. 11, 22 n. vii, questions the certainty of her prior attribution of MMA 2009.400.111–119, including this work, to Valenciennes [see Ref. Lacambre 1996].
Esther Bell. "Catalogue Raisonné of the Thaw Collection." Studying Nature: Oil Sketches from the Thaw Collection. New York, 2011, pp. 145–46, 148, no. 138, ill. (color), calls it "Waterfalls and Rocks at Terni".