The linked document isn't representative of books on Lisp or Emacs---it reads like a half-finished idea for a sketch of a pitch for a book. Since it is more than 10 years old, the project likely got abandoned at a very early stage. Writing a book is a lot of work, so don't mean this as criticism against the author. Just thought I'd say it in case someone doesn't want to waste time downloading and building something unfinished.