I can't believe that this would go out of print due to unpopularity. This guide is too good and too popular among river rats I know. I suspect liability issues, though I really hope it is coming out again, new and improved
This definitive guide of runnable rivers in the West features detailed directions to put-ins, take-outs, mile-by-mile guides to the rivers (including descriptions and suggestions of routes and scouting points in major rapids).
I love this book so much and regard it as so valuable that I'm almost tempted to pay the astronomical and ridiculous fee of $75 to once again own a copy. But I probably won't.