This is the original first edition first printing of Behind The Walls Of Terra By Philip Joseph Farmer Printed in 1970 as an Ace Paperback. This book is in fair condition with some signs of age or wear. There are some scuffs in the cover and spine and some aging on the page edging. The inside of the book is clean with no writing or underlining and the binding is strong. There are no missing pages. All details are shown in the listing photos.