brown, watson digit books imprint p/b first printing, sfaiaa first uk edition
first published ives, washburn h/cvr (us 1955), first p/b avon books cat# 685 mmpb (1956)
Front and rear cover images added!
Stewart Sterling was a pseudonym used by Prentice Winchell.
Cover art by A. Leslie Ross.
Story originally published by Avon Books # 685 (1955) in the US with alternative cover art!
Digit cover art previously used on Monarch Books cover # 117 'Stronger Than Passion' - 1959.