The Gun Owner's Handbook
Buy It Now: $29.99
The Gun Owner's Handbook is a great reference book for the beginning gunsmith or firearm fan. It covers shop setup, tools, cleaning, touch up bluing, browing, stock repair and scope mounting.
If you're looking for indepth informaiton on a certain type of firearm (shotgun, rifle, handgun) or brand you will want to find something more specific. This book does a good job of giving an overview but if you need more dig into that niche. More . . .