Yale Cites Wikipedia' (And Other Best Signs From College GameDay)
Winged football helmet - Wikipedia
Helmet-to-helmet collision - Wikipedia
File:Football helmet - rough.svg - Wikipedia
ISU engineering students design, study safer football helmets - College of Engineering News
File:1970-1975 WSU Football Helmet.png - Wikipedia
File:Nittany Lions football helmet.png - Wikipedia
File:Syracuse football helmets.jpg - Wikipedia