I hadn't heard about the two versions, mine is the one that covers 1905-08, the only other version I've heard of was one that covered the minor denomination coins of the teens, but I am not sure that's out yet. Roger Burdette is a member of the NGC forums (RWB is his ID) and I just PM'ed him and he told me how to order it. Many fascinating things, unfortunately I have so little time and about 12 books on my reading list for the summer!
I did a google search and found this info:
Renaissance of American Coinage 1905-1908 is the second of three books exploring the coinage redesign of 1907-1921. A companion volume covering the 1916-1921 period (ISBN 0-9768986-0-8, available from the publisher.) was released in October 2005, and a third volume covering 1909-1915 is planned for release in 2007.
The book is available direct from Seneca Mill Press LLC, PO Box 1423, Great Falls VA 22066 for $64.95 plus $4.50 postage
If you would like a signed copy, just contact Roger through the NGC board and you can request one that is personalized or just signed at no extra cost (you can also just include a note requesting it be signed when you mail in your order).