Knight, Damon. Masters of Evolution.
Smith, George O. Fire in the Heavens.
New York: published by Ace Books, Inc. 1959.
Small octavo, pictorial wrappers. Ace double #D-375. First printing and first paperback edition of Masters of Evolution. Stress creases to covers, light wear, light rubbing to edges; light wear to spine; light age tanned text pages; Very Good.