By Jack Lovejoy. 1978.
By Russell M. Griffin. 1979.
By John Victor Peterson. 1970.
By Poul Anderson. 1976.
By Neal Bell. 1974.
By James P. Hogan. 1982. This edition, 1984. Cover art by Darrell K. Sweet.
By Kenneth Bulmer. 1967.
By Keith Laumer. 1968. A volume of stories by Laumer including Greylorn, The Night of the Trolls, The Other Sky, and The King of the City.
By Vonda N. McIntyre. 1978. This printing, 1994. Cover art by Jean Pierre Targete.