Fantasy & Horror in the Ace Letter-Series Editions: A Collector's Notebook, Silver Sun Press, 1996. External links Ace Image Library. Contains images of most covers for the doubles in all genres, as well as many of the single titles. History on the Penguin Group website 1952 establishments in the United States American speculative fiction publishers Book publishing companies based in New York (state) Fantasy book publishers Pearson plc Publishing companies established in 1952 Science fiction publishers