| W. & F. Langenheim No.235 Talbotype, W. & F. Langenheim. Philada. Mar 5.1849. [Portrait of Frederick Langenheim] 1849 (ca) Calotype negative, with ink handiwork (here as a positive) 19.3 x 14.8 cm Creative Commons - Wikipedia Courtesy of Christie's, NY,6-7 October 2010, Sale 2395, Lot 317 LL/47179
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