Whenever I've encountered a problem or just wanted to understand a technical challenge, I've always had a photography book or two to turn to. Mine has been my old college standbys called "Basic Photography" and "Advanced Photography" by the late Micheal Langford published by Focal Press. ISBN 0 240 51592 7
What is your text book of "last resort" when confronted with a photographic problem you just can't seem to solve? A brief narrative as to why you feel this is the book(s) for you would be interesting also. I'm interested in philosophical texts that relate to photography as well.
I would appreciate it if you could include the ISB Number to make tracking down a copy on Amazon.com or Chapters/Indigo.ca easier

Thanks,
Poliwog