What is the best resource for cleaned coins

No, not a "how to" guide. Is there a best-in-class book on detecting cleaned coins, a good computer training course or DVD?
Tom
NOTE: No trees were killed in the sending of this message. However, a large number of electrons were terribly inconvenienced.
Type collector since 1981
Current focus 1855 date type set
NOTE: No trees were killed in the sending of this message. However, a large number of electrons were terribly inconvenienced.
Type collector since 1981
Current focus 1855 date type set
0
Comments
A "how to book" might just have some good pointers on what to look for, maybe?
NOTE: No trees were killed in the sending of this message. However, a large number of electrons were terribly inconvenienced.
Type collector since 1981
Current focus 1855 date type set