Signature: Lower left, "Robert Adam Architect, 1760"
Inscription: At top: "Design of a Greenhouse for the Right Honble The Earl of Coventry"
Ogden Codman, Jr. (American, Boston, Massachusetts 1868–1951 Grégy-sur-Yerre); Donor: Estate of Ogden Codman, Jr.
John Harris, Catalogue of British Drawings for Architecture...in American Collections, 1971, p. 4, pl. 2