File talk:2020.jpg
[http://www.nga.gov/content/ngaweb/research/casva/research-projects.html A Project of the National Gallery of Art, Center for Advanced Study in the Visual Arts ]
Plate from Plantae et Papiliones Rariores (1748-59), Bibliothèque de l’Université de Strasbourg, France
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http://www.plantillustrations.org/illustration.php?id_illustration=213071