It's published by the MSF and the full title, not surprisingly, is “The Motorcycle Safety Foundation’s Guide to Motorcycling Excellence".
But I imagine that took up too much space on the cover and they shortened it.
Anyways this was released last September and I'm just now hearing about it...which is generally how my ebb and flow of knowledge works.
Anyone read it? I still haven't found a copy of Proficient Motorcycling (will have to order it online I guess) and just looking for books to add to my reading list.