AFAIK R Babels book, the 700 odd page one, was withdrawn from publication in English, but was published in German. Am I wrong about that?
The 1st edition was Das Guru Book, then the 2nd and slightly updated edition was in English as The Guru Book.
There was supposed to be a heavily updated 3rd edition around 10-ish(if memory serves me) years ago but a PDF of it was leaked to the internet so Ralph never published it sadly.
Mine is the second edition.