How has the NFL's final undefeated team finished each season? – NBC Sports Chicago
Showing Who's No. 1, Patriots Deal Colts Loss No. 1 - The New York Times
What football teams have gone undefeated in NFL history? - AS USA
20 NFL teams that started 9-0 since 1972 Miami Dolphins
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1972 Miami Dolphins: The inside story of the only perfect season in NFL history
1972 Miami Dolphins: The inside story of the only perfect season in NFL history
List of last undefeated NFL teams by season - Wikipedia