| H. Blackwell (British, active late 19th - early 20th century) [Attributed to] Spirit Photograph 1900 (ca) Cyanotype 5 9/16 × 4 1/16 ins (14.1 × 10.3 cm) (image and sheet) Philadelphia Museum of Art Gift of Harvey S. Shipley Miller, 2014, Accession Number: 2014-199-26 LL/71369
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