Replay review in gridiron football - Wikipedia
Super Bowl LI - Wikipedia
NFL Football Operations NFL Football Operations
History of Instant Replay
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The History of Instant Replay in the NFL, News, Scores, Highlights, Stats, and Rumors
History of Instant Replay
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Upon Further Review: A Brief History of Instant Replay
Reviewing Instant Replay: Observations and Implications from Replay's Inaugural Season – Society for American Baseball Research