License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
George Augustus Sala. The Great Exhibition "Wot is to Be", Probable Results of The Industry of All Nations in The Year '51, Showing What is to be Exhibited, Who is To Exhibit, in Short How Its All Going to Be Done, 1850. The Metropolitan Museum of Art.