Ryan Clark & James Harrison's HARDEST HITS
The Ones Who Hit the Hardest: The Steelers, the Cowboys, the '70s
Hardest Hitters in NFL History - Sports Illustrated
Dallas Cowboys - Wikipedia
10 Best Pittsburgh Steelers Defensive Players of All Time - Sports
The Pittsburgh Steelers History vs. the Dallas Cowboys
The Last Headbangers: NFL Football in the Rowdy, Reckless '70s
Book Review: The Ones Who Hit the Hardest - WSJ
Steelers Bombard Cam Newton, Grab Hold Of League Lead In Sacks