Ormsby Mitchel, c. 1860-1870, Smithsonian: National Portrait GallerySize: Plate: 9 × 6 ×
Ormsby Mitchel, c. 1860-1870, Smithsonian: National Portrait GallerySize: Plate: 9 × 6 × 0.2 cm (3 9/16 × 2 3/8 × 1/16")Medium: Glass plate collodion negativehttps://npg.si.edu/object/npg_NPG.81.M1153 -- source link
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