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. Cover for 'Cantares Oaxaqueños: Nueva Coleccion de Canciones Modernas para 1898', couples walking arm in arm on the outskirts of a town, ca. 1898. The Metropolitan Museum of Art.