License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
José Guadalupe Posada. Broadsheet with new and entertaining verses about a 'Brave Man from the Heartland to His Friends' a caricature of a horseman and his horse and a group of men playing billiards, 1902. The Metropolitan Museum of Art.