Hidden Valley - Hidden Valley Bunker L1

In the Surgery room where Scribe Schuler spends most of her time, in a plastic bin next to the desk.

Old Nuclear Test Site - Nuclear Test Shack

This book is on a table along the south eastern wall of the shack, under another book near a Hunting Shotgun.

REPCONN Headquarters - REPCONN Office 2nd Floor

In the north eastern corner of the level, on a desk next to a terminal [Very Easy] from which you can add your facial data to the database for the 2nd floor.

REPCONN Headquarters - REPCONN Office

Main Floor In the north western corner of the level, behind a locked door [Very Hard]. This book is on top of a safe, amidst numerous Microfusion Cells. Note that it’s possible to reach this room by going through a locked door [Hard] on the REPCONN Office 2nd Floor.

[Dead Money] Sierra Madre - Sierra Madre Vault

When you reach the vault door, turn south and jump on some pipes below the floor (you should see a skeleton on them, and yes, you’ll have to endure toxin.) You can find this book in ‘Sinclair’s Bag’, which is between the two pipes, near the skeleton. To get out of the poison, head east along the pipe, jump up onto a pipe valve, then onto an elbow pipe. Note that this is one of the few books in the game that you can actually miss.

[Lonesome Road] Hopeville Missile Base HQ

From the entrance head south to immediately find some bookshelves. This book is located under a ‘Large Burned Book’ on the lowest shelf of the southernmost bookshelf.