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Continue to ChatPortrait of Niépce in Heliogravure 1856 https://graphicarts.princeton.edu/2018/02/07/portrait-of-niepce-in-heliogravure-1856/
Portrait of Niépce in Heliogravure 1856 https://graphicarts.princeton.edu/2018/02/07/portrait-of-niepce-in-heliogravure-1856/