Sure the artwork looks nice and all that... but the concept makes no sense.
If the manual was made before the war for people who were going to live in the vault (at one point, it says something like "many weapons will survive the nuclear event") then how the hell would the author have known about all of these monsters? Or, if it was written by someone in the vault, we know that people were not supposed to be able to leave the vaults, so again how the hell would they know about all of the stuff on the outside?
Once again Beth fails at logic and common sense. If it was just a little manual, who would care? But the writing for the whole game appears to be infected with this kind of lazy stupid-think. The truth is, these guys just don't have much of an imagination.