| Nicolaas Henneman Metal stamp: "Patent Talbotype or Sun Pictures". n.d. Metal stamp Science Museum Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence, Credit: Matilda Talbot, Object number: 1937-359 LL/82813 In the Science Museum collection this is credited to Henry Fox Talbot but it seems likely this stamp was used by Nicolaas Henneman.
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