Lower left, label in print: Ferns.; lower right, label in print: Specimen of Cyanotype
(Hans P. Kraus, Jr., Inc., New York); NGA purchase, 2007.
Associated NamesKraus, Jr., Inc., Hans P.
- In the Darkroom: Photographic Processes Before the Digital Age, National Gallery of Art, Washington, 2009 - 2010, unnumbered catalogue.
- The Eye of the Sun: Nineteenth-Century Photographs from the National Gallery of Art, National Gallery of Art, Washington, 2019, unnumbered catalogue.
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