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Great read for the "x and o" inclined of the group.
Link
grantland.com
Cassino sort of touched on this in one of his "Better Know the Playbook" series. A very cool read about the evolution of offensive play calling. No matter how well you think you know football, this is the type of thing that's almost impossible to see if you don't take the time to watch, and rewatch, game film. Very cool. Very informative. Make sure you read the side notes.
