The World of Lithpriting by Tim Rudman
Mike Ware’s books on Gold in photography
Mike Ware’s books on the chrysotype photographic processes
The Wet Collodion Plate. 16 Steps To Making The Plates by Will Dunniway
Exploring Simple Lenses is a very practical book from John Evans, the author of Adventures with Pinhole and Home-made Cameras
The book of carbon and carbro by Sandy King
A Non-Silver Manual: Cyanotype, Vandyke Brown, Palladium & Gum Bichromate with instructions for making light-resists including pinhole photography by Sarah Van Keuren
The book Alternative Processes Condensed by Christina Z. Anderson
Diffusion magazine – unconventional photography. The first issue of the magazine. Free to download.
The World Journal of Post-Factory Photography by Judy Seigel. A free download of issue 1.