by zeke79 » 6 Dec 2012 9:18
Thanks for mentioning that Legion303. I wasn't aware of Ollam's book and haven't picked up Graham's book in awhile.
For the best book out there on high security locks and their operation, take a look at amazon.com for High-Security Mechanical Locks An Encyclopedic Reference. Written by our very own site member Greyman! A true 5 Star read!!