Asked and Answered: Dec. 23
Steelers official and unofficial retired numbers : r/steelers
I hope this pushes the organization to give their legends their official flowers sooner. Steelers history is far too rich to only have 2 Jerseys officially retired. Franco should of had this
The Best Seahawks Players By Jersey Number: 61-80
Steelers Fan Friday: Why all the hoopla over player jersey numbers? - Steel City Underground
In The Shadow Of Greatness: History Of Steelers Who Inherited Legendary Jersey Numbers - Steelers Depot
Steelers retired numbers: Which jersey numbers have they retired both officially and unofficially?
Steelers to retire Harris' number '32'
The Pittsburgh Steelers list of unofficially retired numbers