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. A group of Zapata followers on horseback from a broadside entitled 'Most wonderful miracle by the intercession of Our Most Blessed Lady of Perpetual Help worshipped in Cholula', ca. 1910–11. The Metropolitan Museum of Art.