I thought wiki was considered an unreliable source. (From a Matt Canada Google search the other day) : r/steelers
File:Topps 1956 pittsburgh steelers card.jpg - Wikipedia
Russ Grimm - Wikipedia
The Steel Curtain
The Steel Curtain
Focus On: 100 Most Popular Pittsburgh Steelers Players: Ben Roethlisberger, Michael Vick, Terry Bradshaw, Ed O'Neill, Antonio Brown, LeGarrette Blount, football), Mike Webster, T. J. Watt, etc. eBook : Wikipedia