The Top 10 NFL Defenses of All Time
Buddy Ryan's 46 Defense (1985 Bears), NFL Films Encore
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What is the best single-season defense in NFL history? - Quora
Top Ten Single Season Defenses in NFL History : #10 1986 Chicago
Top Ten Single Season Defenses in NFL History : #8 1975 Minnesota
Top Ten Single Season Defenses in NFL History : #10 1986 Chicago
10 greatest defenses in Super Bowl history: From 1985 Bears to
Top 10 Best Defenses in NFL History