Generation Ships and Martian Rebels: Rich Horton on 200 Years to Christmas by J. T. McIntosh and Rebels of the Red Planet by Charles L. Fontenay
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In its 26-year history (1952-1978) the Ace Double series published over 520 SF novels and collections, including original work by some of the greatest SF writers of the 20th Century, such as Philip K. Dick, Jack Vance, Poul Anderson, Robert Silverberg, Samuel R. Delany, Fritz Leiber, Clifford D. Simak, John Brunner, Brian Aldiss, and many others.
Of course, it also published writers who aren’t nearly as well remembered today, like Margaret St. Clair, Kenneth Bulmer, Robert Moore Williams, Charles de Vet, William F. Temple, Robert Lowndes, Jack Sharkey, Jerry Sohl, and others. As you probably suspect, not all of those books are winners, but there’s plenty of interesting stuff buried in the dusty nooks and crannies of the Ace library.
And Rich Horton is the guy to find it. He has an ongoing series of reviews of Ace Doubles at his website, Strange at Ecbatan. Recently he talked about a forgotten Ace Double from 1961 by two writers I’m unfamiliar with: the generation-ship tale 200 Years to Christmas by J. T. McIntosh, and a novel of forbidden genetic experiments and rebellion on Mars, Rebels of the Red Planet by Charles L. Fontenay.