Clay Matthews of Green Bay Packers wearing visor to protect previously broken nose - ESPN
History of the football helmet - Wikipedia
John Glenn becomes the first American to orbit Earth in 1962 – New York Daily News
History of the Football Helmet timeline
Empowering the Next Generation to be The Athlete No One Saw Coming
Magic Johnson chides his Commanders for 'no intensity' in a 40-20 loss to previously winless Chicago –
Are Modern Football Helmets Any Safer than Old-School Leather Ones?, Science
Legacy of the twenty six by Multnomah Athletic Club - Issuu
New Football Helmet Could Save the Sport