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    Murray Leinster: Sidewise in Time Signed Subscriber's Copy. (Chicago: Shasta Publishers, 1950), first edition, 211 pages, maroon cloth with silver lettering on spine, 12mo (5.25" x 7.75"), dust jacket (in protective Mylar). Jacket illustration by Hannes Bok. The author signed both his name and his nom de plume on the front free endpaper: "Will F. Jenkins/ 'Murray Leinster'". Murray Leinster was the pseudonym for Will F. Jenkins, an American author and inventor who served in some capacity in both world wars of the twentieth century. First published in Astounding Stories in June, 1934, Sidewise in Time is generally considered the first story to employ the idea of parallel universes. This idea was hugely influential on subsequent science fiction authors, especially Isaac Asimov. In fact, the World Science Fiction Convention bestows an annual award on the best short- and long-form alternate history stories called the Sidewise Award. The copy presented here is fine, with only minimal wear present on the edges of the dust jacket. Sidewise in Time is rare in this condition. From the Ventura Collection.

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