Ace books entered the paperback field in 1952 by offering double novels, usually edited by Donald A. Wollheim. These contained two complete novels, with individual covers. In 1954, they began offering single standard novels and continued alternating throughout the series. Outstanding authors in this series were Louis L'Amour, Day Keene, Harry Whittington, Robert Bloch, William Irish and others. They used some of the top artists for their covers such as Norman Saunders, Frank Frazetta, Robert Maguire and Roy Krenkel. |