si-national-portrait-gallery:Unidentified Woman, c. 1860-1870, Smithsonian: National Portrait Galler
si-national-portrait-gallery:Unidentified Woman, c. 1860-1870, Smithsonian: National Portrait GallerySize: Plate: 8.9 × 6.1 × 0.2 cm (3 ½ × 2 3/8 × 1/16")Medium: Glass plate collodion negativehttp://npg.si.edu/object/npg_NPG.81.M2542 -- source link
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