Miami Dolphins complete perfect NFL season.
NFL on Twitter: Only one team in NFL history has ever completed a perfect season: The 1972 @MiamiDolphins. 50 years later, @cfrelund breaks down the numbers to show us just how difficult
1972 Miami Dolphins: The inside story of the only perfect season in NFL history
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1972 Miami Dolphins: The inside story of the only perfect season in NFL history
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