Alliance of American Football Archives - Front Office Sports
Pro Football Illustrated 1948 : Rocky Wolfe (ed.) : Free Download, Borrow, and Streaming : Internet Archive
Minnesota State Archives - Remember the "Gridiron Glory" pro football exhibit is at the MN History Center September 24, 2016 to January 15, 2017: http://www.profootballhof.com/connect/gridiron-glory/. And as you may know, St. Paul's