Unidentified Woman, c. 1860-1870, Smithsonian: National Portrait GallerySize: Plate: 8.9 × 5.9
Unidentified Woman, c. 1860-1870, Smithsonian: National Portrait GallerySize: Plate: 8.9 × 5.9 × 0.3 cm (3 ½ × 2 5/16 × 1/8")Medium: Glass plate collodion negativehttps://npg.si.edu/object/npg_NPG.81.M3180.1 -- source link
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