A Non Silver Manual
Cyanotype, Brownprint, Palladium & Gum Bichromate with Instructions for Making Light-Resists Including Pinhole Photograpy.
Sarah Van Keuren Buy it from the author here
Alternative Processes Condensed
A Manual of Gum Dichromate and Other Contact Printing Processes Christina Anderson Another guide packed full of information from the author of "Experimental Photography Workbook".
Siderotype Report 1
Mike Ware
An e-journal dedicated to furthering good practice and understanding in the area of iron-based photographic printing.
Coming into Focus
John Barnier
Practical instructions on 20 processes. Highly recommended