That's a book on Federal laws. It's my belief that for most users, state laws are far more important to know that Federal laws. Most federal laws pertain to importation, sales, etc...all of which are already taken care of when you walk out of the store with your gun. Of course, that's not all of them and there are some you need to know...like whether you can give your brother in Washington your handgun, even though you live in Idaho. And the Federal bans in Federal building too.
Most Federal laws are very general (not all, of course). State laws are usually much more specific and expand on some of the general federal laws. Which is why I recommended a book specifically about state laws...such as (if you're from Arizona):
http://www.amazon.com/The-Arizona-Gu...+guide+arizona
There's books for practically every state, and I know that particular book actually goes into federal laws that are pertinent as well.