A friend of mine who owns a small music shop gave me his copy of that book many years ago. It is a good read but unless it has been revised this book was the reason I thought my 1942 J50 was a J45 which had lost their finish because it stated that model did not appear in the catalog until 1947.Great video; thanks for posting. My wife gave the Gibson's Fabulous Flat-Top Guitars book for Christmas, and that was a nice video accompaniment. I hadn't realized until reading it how badly the quality slipped on Gibson's acoustics during the 1970s, something that Williams addressed as well.
Another interesting book that covers part of the history of these amazing guitars is Kalamazoo Gals. A great read. Highly recommended.