License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Honoré Daumier. Ils appellent ça UN GRAIN!..., from Aux Bains de Mer, published in Le Charivari, September 19, 1859, September 19, 1859. The Metropolitan Museum of Art.