Originally Posted by Nikita
It's 140 pages vs. the 25 page PDF, but in the first few pages on the Quick Look, it appears to be the same text in bigger font on smaller pages.

The foreword refers to "this greatly expanded book version." Six pages of the book cover 2 pages of the PDF - but the foreword and illustrations get you to page 15. So I'd guess some new material, but not twice as much stuff as the original.