Says Baldy about this book:

This book has really stood the test of time for me. I've probably handled 500 print color complaints by very good photographers who genuinely felt EZ Prints had missed the color, only to delve into the numbers and find the problem. We have a Skin Tone Tutorial based on Dan's stuff that has completely removed the mystery from getting prints right for so many of our photographers.

The book is a little tough to thoroughly understand, but after the hard work of gr0king it, it's pure gold in my opinion.

You can find it on Amazon.com: Professional Photoshop: The Classic Guide To Color Correction

Discussion on this book at Dgrin Forums.