This may be the best book and it's great that you can download it for free, but it's scanned, and that makes it horrible to read. Still I marked it in my book list under math, and hope I'll find the time to read it in the future. I will buy a decent EPUB or PDF then. I don't mind to pay for that convenience.
Your comment prompted me to look at the contents of the online PDFs. They are scanned-in documents, but I didn't find the text too hard to read. To my surprise there were active links to sections of the book from the TOC. Certainly for the free price it's a generous thing to offer.
