Not in book form, but there have been lots and lots of very useful and technically astute articles published in the camera magazines over the years (just one example - Paul Hansma and Stephen Peterson's articles in Darkroom Techniques on optimal focusing of the view camera). Rather than keeping stacks and stacks of these, I periodically (once a year or more) go through them and tear out articles that have helped and/or or of interest. I've put these into a binder, categorized by subject/topic (e.g. Film Development, Print, Mounting, etc.). So this has become one of my principal technical "books."
Bookmarks