Do face masks work? Here are 49 scientific studies that explain why they do
Wild facemasks of the NFL
The 20 Craziest Facemasks Ever Worn In The NFL That Are Now BANNED
NFL banning facemask used by Tuck, Dockett, Mathis and others : r/nfl
Wild facemasks of the NFL
NFL bans the coolest player facemasks
NCAA bans 'overbuilt' facemasks, SEC adds 8th official and other rule changes for 2015 season
Leatherhead to Radio-head: The Evolution of the Football Helmet, Arts & Culture
Was there a reason that the NFL outlawed the one bar face mask? Was there a particular incident that caused them to make players not to use them anymore? - Quora
The story behind John Buck's New York-centric catcher's mask - Newsday