License, verbatimPD
The National Gallery of Art: open access image with no usage restrictions under the NGA's open access policy (openaccess=1 in the Gallery's published_images dataset).
Francesco Petrarch (author) and Hans Weiditz, II (artist). Von der Artzney bayder Glück (De Remediis Utriusque Fortuna) (On the Remedies of Good and Evil Fortune), 1532. National Gallery of Art, Washington.