See Douwe’s slides for this project on Flickr: https://www.flickr.com/photos/96630454@N06/
Mike Ware’s Cyanotype page: https://www.mikeware.co.uk/mikeware/New_Cyanotype_Process.html
David Allan on IG https://www.instagram.com/dbloomsday/
Anna Atkin’s cyanotypes: https://www.nhm.ac.uk/discover/anna-atkins-cyanotypes-the-first-book-of-photographs.html
Adam Savage, Every Tool is a Hammer https://www.amazon.com/Every-Tools-Hammer-Life-What/dp/1982113472
Post Exposure by Ctein https://www.amazon.com/Post-Exposure-Second-Techniques-Photographic/dp/0240804376