I picked up a copy of this book recently. The title is somewhat misleading as the book is really a history of the creation of the trail through Maine. Lots of great historical photos of the original trail routing and many of the sporting camps and other points of interest along the way. The biggest disapointment is that its way too short as I expect the archives have a lot more photos and there is a lot more history.
For those just hiking through its not a "must read", but for those who want to know the history of the Maine AT, its a good start and will leave you wanting for more.
Its available in many locations on the web, but I expect the MATC would appreciate the orders through their website.