File talk:1042.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 ]
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Edition from Smithsonian Libraries digitized on archive.org:
Plate:
https://archive.org/stream/theorypracticeg00DeYz#page/n252/mode/1up