| William Langenheim Frederick Langenheim Looking at Talbotypes 1849-1851 (ca) Daguerreotype 4 3/4 x 3 1/2 ins (visible) 6 x 4 11/16 x 5/8 ins (case) Metropolitan Museum of Art Gilman Collection, Gift of The Howard Gilman Foundation, 2005, Accession Number: 2005.100.177 LL/40314
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