Humorously, it was Ralph that popularized the PDF. It wasn't common knowledge until he ranted about it. As I recall, it's a quality scan and fully searchable. The content is black and white, so it's not like it needed to be anything other than greyscale anyway. Still, I'm sad
Ralph never published the third edition. The only winner was Ralph's ego.
Actually, from that stand-point it was more Ralph's ego which was a casualty. Everyone lost, including whomever did all the work to scan and distribute something which is not up-to-date (I don't want to say out-dated because obviously it's still useful.)
In any case, I have an English Guru Book and it's great reading. Even though I'm not a developer I have found it incredibly informative and helpful in understanding the how and why of Amiga.