| Unidentified photographer Cooper [Doppelportrat eines Kupers] 1855 Daguerreotype 5.5 x 6.7 cm (image) 6.9 x 8.2 cm (plate) Private collection of W. & T. Bosshard Courtesy of Carl Mautz Vintage Photography & Publishing LL/16201 This Daguerreotype was published in Kunst und Magie der Daguerreotypie Collection of W. + T. Bosshard by René Perret (2006), p.134
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