License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
William Wyon. In Honor of the Surgical and Pathological Discoveries of Sir Benjamin Collins Brodie, Bart., Sergeant-Surgeon to George IV, William IV, and Victoria (1783–1862), 1841. The Metropolitan Museum of Art.