Perhaps Paul Sandby sale, 4 May 1811 (81 - A ditto [original drawing/sketch], a fragment of rock: this study appears to have been greatly admired by Mr. Wilson, who introduced it into several of his pictures), bt 'C' (7 gns); [...] Cyril and Shirley Fry; bt Maurice Sheppard, 1983; donated to the National Library of Wales, 2008