OT: NFL Guide For Statisticians

[QuantumMechanic]

Ran across this and thought some might find it interesting. It's a guide the NFL gives to stadium statisticians.
http://www.nflgsis.com/gsis/documentation/stadiumguides/guide_for_statisticians.pdf
(GSIS = "Game Statistics and Information System" - http://www.nflgsis.com/Help/About.html)