Sky Lift
Robert A. Heinlein
He Who Fights with Monsters 2: A LitRPG Adventure
Shirtaloon
He Who Fights With Monsters (2)
The Number of the Beast
Password Authentication with Insecure Communication
Leslie Lamport
Flatland: A Romance of Many Dimensions (Mobi Classics)
Edwin A Abbott,
The Grand Design
Stephen Hawking & Leonard Mlodinow