Available Editions

Novel

Hardcover

Book cover for Behind the Walls of Terra
1982 Year
Phantasia Press Publisher
ISBN-13: 978-0-932096-13-5
ISBN-10: 0-932096-13-1
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Paperback

Book cover for Behind the Walls of Terra
1984 Year
Berkley Books Publisher
ISBN-13: 978-0-425-07558-6
ISBN-10: 0-425-07558-3
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Digital Books

Book cover for Behind the Walls of Terra
2012 Year
Gateway / Orion Publisher
ISBN-13: 978-0-575-11962-8
ISBN-10: 0-575-11962-4
Not Available for Purchase

All-In-One

Hardcover

Book cover for The World of Tiers
2001 Year
Science Fiction Book Club Publisher
ISBN-13: 978-0-7394-1664-8
ISBN-10: 0-7394-1664-2
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Paperback

Book cover for The World of Tiers: Volume Two
1997 Year
Tor Publisher
ISBN-13: 978-0-312-86377-7
ISBN-10: 0-312-86377-2
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Digital Books

Book cover for The World of Tiers: Volume Two
2017 Year
Open Road Integrated Media Publisher
ISBN-13: 978-1-5040-4602-2
ISBN-10: 1-5040-4602-1
Not Available for Purchase