Caddie School 101: Reading a green contours book

The green contours books used by players and caddies on the PGA Tour each week are incredibly sophisticated (and, as a result, quite expensive, too). Veteran caddie Kenny Harms gives you an inside look at his green contours book from East Lake Golf Club and explains that though it may cost a pretty penny, it is definitely money well spent.
Greens books should be outlawed. They severely slow the game down and take away from the skill and art of the game.