Pro Football Journal: Facemask Oddities
NFL helmet face mask question - Sports Logo News - Chris Creamer's Sports Logos Community - CCSLC - SportsLogos.Net Forums
Best and Worst Helmets of the Sun Belt and Conference USA - Page 3
How the dark visor defined college football - Banner Society
Pro Football Journal: Facemask Oddities
History of the NFL Helmet
The Goalie Mask, Reenvisioned
How Helmets Have Evolved to Prevent Football Concussions - Chester County Hospital
Chicago Bears Helmet - National Football League (NFL) - Chris Creamer's Sports Logos Page