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The Robert A. Heinlein novel Beyond This Horizon lists "the clever and repulsively beautiful pseudo-feminine freemartins" as one of the genetically-engineered specialist types of humans that were created in the "Empire of the Great Khans" (chapter 2).
During that period, he also edited Grosset & Dunlap's Science Fiction Classics series, which he conceived as an inexpensive alternative to hard-to-find small-press editions of such titles as Robert A. Heinlein's Beyond This Horizon and Isaac Asimov's I, Robot, although the first title in the series (Henry Kuttner's Fury) was that story's first book publication.