Particpants in the alt.photo.process group raved about a new book by Christopher James called "The Book of Alternative Photographic Processes." I haven't read it but based on everything I've read about it by people in that group who have lots of alt process experience, that's the book I'd buy. I have and have used "The Keepers of Light" and it was an excellent book in its day because there was nothing else like it around but it isn't the book I'd buy today.