What is the longest amount of games an NFL QB has gone without throwing an interception from Week 1 onwards in a single season? - Quora
Down But Not Out: The 1976 Pittsburgh Steelers - The Sports Column
How dominant was the Steel Curtain defense? The 1976 Steelers' defense had an remarkable nine-game stretch, where they allowed only two touchdowns and a total of 28 points, including five shutouts. 8/11
The Steel Curtain May Fit Around Steelers' Present Defense - The New York Times
The Top 10 NFL Defenses of All Time, News, Scores, Highlights, Stats, and Rumors
NFL 100: Greatest NFL players ever by jersey number
Top 3 All-Time NFL Defenses - #3 The 1976 Steel Curtain
Top 3 All-Time NFL Defenses - #3 The 1976 Steel Curtain
The Top Ten Steelers' Draft Classes Of All-Time (4-3) - Steelers Depot
Top Ten Single Season Defenses in NFL History : #4 1976 Pittsburgh Steelers
Statistical analysis of the greatest defenses in NFL history - Behind the Steel Curtain
Determining the best NFL defenses of All Time (with the help of excel) : r/ nfl
What is the best single-season defense in NFL history? - Quora
The Ten Greatest NFL Defenses in the Super Bowl Era - Nick Deiuliis
The Top 10 NFL Defenses of All Time, News, Scores, Highlights, Stats, and Rumors