It can be found in the Greener Pastures Disposal Site's main office on a desk, next to a computer terminal. Careful, though. A field full of nuclear waste, a large amount of radiation, and maybe even a deathclaw or two (confirmed on 360,PS3 and PC) stand in your way. If you have Broken Steel downloaded, it is possible a few Albino Radscorpions will spawn in the area as well.
Obtaining Bobblehead Agility