Fallout 2 and Fallout Tactics
Gain 50% more skill points when reading books.
Fallout 3 and Fallout: New Vegas
Gain 2 skill points per read book instead of 1.
Fallout: The Roleplaying Game
Gameplay article: Fallout: The Roleplaying Game
Roll 1d6 after using the effect of a magazine to retain it for an additional use.