I have macular degeneration and find enlarging the type fonts on my Kindle afford pleasurable reading experience. I could not have enjoyed Mark Twain (the autobiography) in the printed version. Thank you Kindle.
The $10 price for the E-book is a bargain. It is complete, and has "hot links" to jump to the footnotes and back to the text. I have it on my netbook, and I really like that I can enlarge the fonts to make the words BIG for my aging eyes.
That work is a different one than the one here. This one contains material not previously released and I am guessing a substantial part of it is copyrighted. There are still two more volumes projected for this series.