HELIOS One - HELIOS One Power Plant

In the upstairs bedroom, on the bed.

Mesquite Mountains Crater - Hell’s Motel

In the first room, this book is on a counter along the northern wall, behind a globe, harmonica, and an ashtray.

Novac - Ranger Andy’s Bungalow

This book is on the bed in Ranger Andy’s house.

[Dead Money] Villa - Clinic Basement

Unlock the door to the basement [Hard] and head downstairs into the room with the ‘Clinic Power Status Terminal’. The book is on the shelf of a doorless metal locker along the northern wall.

[Lonesome Road] Buried Buildings

Enter the Cave of the Abaddon and travel through it to reach the Buried Buildings. You’ll find this book in the room right before you can enter into the Divide again, on the floor under/near a chair and a nightstand in the southern corner of the room.