BEHIND THE WALLS OF TERRA 1970 Ace 1st Printing	BEHIND THE WALLS OF TERRA 1974 Ace Reprint	BEHIND THE WALLS OF TERRA 1975 Sphere 1st British Printing	BEHIND THE WALLS OF TERRA 1976 Ace Reprint
BEHIND THE WALLS OF TERRA 1977 Ace Reprint Cover Proof	BEHIND THE WALLS OF TERRA 1977 Ace Reprint	BEHIND THE WALLS OF TERRA 1978 Sphere Reprint	BEHIND THE WALLS OF TERRA included in THE WORLD OF TIERS Volume 2 1981 Book Club Hardcover
BEHIND THE WALLS OF TERRA 1981 Ace Reprint	BEHIND THE WALLS OF TERRA 1982 Phantasia Press Hardcover Limited Signed	BEHIND THE WALLS OF TERRA 1982 Phantasia Press Hardcover	BEHIND THE WALLS OF TERRA 1984 Berkley Reprint
BEHIND THE WALLS OF TERRA included in THE WORLD OF TIERS Volume 2 1986 Sphere Trade Paperback	BEHIND THE WALLS OF TERRA included in THE WORLD OF TIERS Volume 2 1996 Tor Hardcover	BEHIND THE WALLS OF TERRA included in THE WORLD OF TIERS 2001 Book Club Hardcover