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American football - Safety, Rules, Equipment
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Youth Football Safety Concussion Awareness
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N.F.L. Will Use Super Bowl Commercial to Stress Safety - The New York Times
What is a safety in football?
Helmets don't eliminate concussions. It's time for the NFL to ditch them, NFL
American Football Equipment List NFL Padding and Accessories – UK Rules
NFL players moving to smaller shoulder pads - Global Sport Matters