Leatherhead to Radio-head: The Evolution of the Football Helmet
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Applied Sciences, Free Full-Text
History of The Football Helmet - Atavus
Modern football helmets no better than 'leatherheads' at protecting against concussions, study finds
Old School: Leatherhead Football Helmets Worked As Well As Modern Ones
Leatherhead to Radio-head: The Evolution of the Football Helmet, Arts & Culture
Design and Virtual Testing of American Football Helmets–A Review
Delaware State University Archives and Special Collections: Helmets Through History
Researchers test old-style leather helmets vs. modern ones and found leather performed as well, better in some aspects. Conclusion: Football helmets need to be softer. : r/nfl
The History of The Football Helmet timeline
