The book's full title is "J.P. Clabrough Birmingham Gunmaker," and is available on Shelton's web site: www.clabrough.com

I think he also had some copies for sale on eBay.

Be aware that he wrote a smaller book on Clabrough over 20 years ago (titled "J.P. Clabrough & Bros.: Gunmakers" and that may come up in searches, but the new edition (2013) is a completely different work. It has 20+ years of research into it.

Researching Lee-Speed rifles, + shotguns sold by Army & Navy CSL. Please send PM w/questions.