The name of the book is "The New Glucose Revolution" by Jennie Brand-Miller and others. I got mine out of the library.
As Karen said, you can also get the GI out of the Mendoza site. I still don't understand the GL completely either; I just go by low GI.
You asked again about high fat on maintenance. I believe, and others please jump in if I'm wrong, that when you start increasing your carbs you have to decrease a little the fat. High fat with high carbs in not good.
Others please comment if I'm wrong!