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).
Theodor Gottlieb von Hippel (author), Daniel Nikolaus Chodowiecki (artist). Lebensläufe nach Aufsteigender Linie nebst Beylagen A, B, C, 1779. National Gallery of Art, Washington.