| Nicolaas Henneman [Attributed to] Copy of an Ackermann’s Colour Chart 1840s (mid) Calotype negative / Digital print National Science and Media Museum 1937-4302, Schaaf 4289 LL/76899 Larry J Schaaf, 14 July 2017, "Summer Pleasures: Ackermann’s Super-Fine", The Talbot Catalogue Raisonné, Blog
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