Took a look at B&N for some Linux security books, and was hoping to get
some recommendations from actual users.
Can anyone offer any advice on the following, or recommend a different
one you think is better?

Linux Security Cookbook (O'Reilly)
Linux Server Security (O'Reilly)
Hardening Linux (Turnball)

I'm a little uncertain about that last one. Evidently it doesn't cover
Apache or mySQL security, and I'd kind of like to have something that
does, at least a little.

Any feedback would be really appreciated!
Liam