Christian von Mechel and Bartholomäus Hübner, after Johannes August Nahl, the Younger
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).
Christian von Mechel and Bartholomäus Hübner, after Johannes August Nahl, the Younger. The Tomb of Madame Langhans, 1786. National Gallery of Art, Washington.