Evan,
Locks, Safes and Security is a very nice book. I have not finished going through it yet, but it is a wealth of information.
I've seen the Complete Book of Locks and Locksmithing posted as a reference for most of the mandatory categories for the PRP, and was wondering if it held much different information than the title Locksmithing. I'll probably pick up a copy and go through it one way or the other.
I recently ordered 'The Fundamentals of Master Keying' from the ALOA store, but unfortunately they are out of stock on 'Master Keying by the Numbers'. I may email them to find out if it is one they have decided to rotate out of stock permanently. The book is sold from the Billy B Edwards, Jr. site, but for
quite a bit more than it is listing on Amazon. I may end up just ordering from his site. He has quite the library on Master Keying now:
http://www.lounginglizardpublishing.com/catalogue.htm