1972 Miami Dolphins the only team in NFL history to go undefeated
The 1972 Dolphins remain the NFL's lone undefeated team
1972 Miami Dolphins perfect season will stand alone among NFL's
50 years on, the 1972 Miami Dolphins' undefeated season remains
Are the 1972 Dolphins The Only Undefeated NFL Team
50 years on, the 1972 Miami Dolphins' undefeated season remains
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