Dean's Electronics

 is a book written for amateur electricians in the 21st century. On the book's cover, there is the picture of a light bulb in a circle lying atop various electrical diagrams. People used this book for learning the field of electronics and repairing electrical equipment. These books are used in the Vault-Tec Vaults.

On July 13, 2268, there is a notice by Stanley Armstrong, a Vault 101 maintenance technician, on the Cafeteria bulletin board requesting the return of his copy of Dean's Electronics.

Fallout, Fallout 2 and Fallout Tactics
For game play, when the player's character reads the book, the repair skill increases by 1.

Fallout 3
For game play, when the player's character reads the book, the repair skill increases by one point. If the player has chosen Comprehension, the repair skill increases by two points.

Trivia
Even though reading the book helps you in repairing guns, there are no pictures whatsoever of a gun on the cover indicating that it was probably never meant to help people repair guns or other defensive weapons.