London: Victor Gollancz, 1972. First Edition. Fine/Fine. First British and first hardcover edition. Signed by Larry Niven on the title page. Bound in publisher's original maroon cloth-affect boards with spine stamped in gilt. Fine, with bruise to foot of spine in a Fine dust jacket with nearly imperceptible fading to the spine. Winner of both the 1970 Nebula Award, and the 1971 Hugo Award for best novel.