I have a hardcopy of this book, but I decided to purchase it for its low cost and ability to travel with me on my Nook Color. I am using the eZ PDF Reader app and this scanned copy works very well.
If there is a critique it is with the maps: yellow on white is visible but challenging in the tablet-sized screen. Also, some maps had white colored words over light grey backgrounds that were difficult to read even on my laptop.
Otherwise, the PDF is a very readable scan and worth buying in lieu of attempting to find a hardcopy.