Professional Football Researchers Association Forum
PFRA is a nonprofit organization dedicated to the history of professional football. Formed in 1979, PFRA members include many of the game's foremost historians and writers.
I was also glad to be told about this. I bought it on Kindle. It's poorly organized, repetitive, and not very well written, and I think the author hurts his case at time by overstating it (but, hell, he is Ray's grandson, so it's forgiveable).
The meat of it is good, though, and I do think Ray deserves to be better remembered than he has been. When he was inducted as a member of the Hall of Fame's fourth class, I don't think anyone of note doubted that he was worthy of the honor, but he's been virtually forgotten since then.