The Hideo Kamimoto book is good and I have a copy but my "bible" is The Acoustic Guitar - Adjustment, Care, Maintenance and Repair by Don E. Teeter, University of Oklahoma Press.

There are many tricks to filling cracks which all work to a better or worse degree according to the nature of the damage.

Let us know what you decide Guest Bill and you can be sure of a lot of good advice here!

Cheers

mooman