Delaware State University Archives and Special Collections
Leatherhead to Radio-head: The Evolution of the Football Helmet
Applied Sciences, Free Full-Text
Applied Sciences, Free Full-Text
Aggies Use Their Heads for New Helmet Design
Leatherhead to Radio-head: The Evolution of the Football Helmet
The Evolution of Football Helmets
How often do NFL helmets get replaced and repainted? - Quora
Design and Virtual Testing of American Football Helmets–A Review