The World of Tiers: Volume Two

From Author Wars - https://authorwars.com/publications/the-world-of-tiers-volume-two-635566.html

Overview:

Title: The World of Tiers: Volume Two
Author: Philip José Farmer
Year: 2017
ISBN-10: 9781504046022
Publisher: Open Road Integrated Media
Price: $19.99
Binding: ebook
Type: Omnibus
Title Reference: Behind the Walls of Terra
Notes:
• This has the author's preferred text of 'Behind the Walls' and 'The Lavalite World' from the limited editions published by Phantasia Press.
• Data from Amazon and Locus Magazine #681 as of 2017-10-02.