Re: Buddy Rich and sheet music...
He couldn't read at all. As an interesting side note, Philly Joe Jones used to read the charts with his band and Buddy would sit there and memorise the entire chart. He was only one of the drummers in the "warmup" position. I know there were a few more other than Philly but I'm at a loss for names, I'm not a BR fanatic (although I do like him).
Class A- as for the book, it's not actually written by Buddy. I bought a copy and it's collecting dust on a shelf on the other side of the continent. It's ghost written by another author, basically works you through some rudiments in the ways that Buddy used to utilise them.