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.
"You can come back and play if you really want to. It isn't the fracture itself that bothers you so much. It's the layoff." -Emlen Tunnell, speaking about breaking a bone in his leg four weeks before the 1954 season opener, in which he played.
Sounds interesting but based on the write up I would be surprised if it goes in depth on the Contract fiasco with the Vikings that led to his departure in 1970.