In October 1843.
Anna Atkins begins publishing Photographs of British Algae: Cyanotype Impressions, a collection of contact printed cyanotype photograms of algae, "by placing the unmounted dried-algae original directly on the cyanotype paper" to form the first book illustrated with photographs.
https://en.wikipedia.org/wiki/Anna_Atkins
New York Public Library provides scans of 285 pages of its copy online:
https://digitalcollections.nypl.org/collections/photographs-of-british-algae-cyanotype-impressions#/?tab=navigation&scroll=3
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