This is the 1987 Chicago Bears 4-3 Defense playbook from Defensive Coordinator Vince Tobin. The 1987 season was a strike shortened year, but the Chicago Bears defense performed well during the season featuring Hall of Famers Dan Hampton and Richard Dent.
Alignments, Run Fits and Responsibilities for the linebackers in the Dallas Cowboys 4-3 Over Stack Defense from the early 1990's.
This is a Defensive Line Manual from the Tampa Bay Buccaneers from 1999. Tampa Bay had one of the best defenses in the league being led by Monte Kiffin. The DL was coached by Rod Marinelli and featured Hall of Famer Warren Sapp.