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The N.F.L. Struggles to Tackle Its Latest Problem: Tackling - The New York Times
Varsity Football Helmet Ratings
Behold: The First Position-Specific Football Helmet
Tracing the Evolution of Player Safety Throughout NFL History, News, Scores, Highlights, Stats, and Rumors
The NFL's Quest for a Better Football Helmet - Sports Illustrated
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Football helmets are creating more problems than they solve
Helmet safety: Inside the complicated equipment industry - Sports Illustrated
NFL looking to introduce new football helmets - Dawgs By Nature
NFL Health and Safety Related Rules Changes Since 2002
NFL Says Regular Season Concussions Rose 18%
Helmet maker rounds out football portfolio with new headgear
A football helmet designed just for linemen arrives. Now will it catch on? - The Athletic