1972 Miami Dolphins the only team in NFL history to go undefeated
1972 Miami Dolphins season - Wikipedia
Which NFL team is undefeated in the league's history?
Every last undefeated NFL team since 17-0 Miami Dolphins
Mercury Morris on the 1972 Miami Dolphins' perfect season
The Panthers Are The Only Undefeated Team In The NFL - WCCB
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The Perfect Season': 1972 Miami Dolphins
NFL - Q: The only undefeated team in NFL history. A: Who are the