The World of Tiers
Subtitle: "Behind the Walls of Terra" and "Lavalite World" v. 2
Publisher: Orbit
Published: Apr 23, 1986
Format: paperback
Number of pages: 325
ISBN-13: 9780722135150
Notes: Source title: The World of Tiers: "Behind the Walls of Terra" and "Lavalite World" v. 2