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Nightfall and Other Stories is an anthology book compiling twenty previously published science fiction short stories by Isaac Asimov. Asimov added a brief introduction to each story, explaining some aspect of the story's history and/or how it came to be written. The main criteria for inclusion were that they had to be …

Nine Tomorrows is a collection of nine short stories and two pieces of comic verse by Isaac Asimov. The pieces were all originally published in magazines between 1956 and 1958, with the exception of the closing poem, "Rejection Slips", which was original to the collection. The book was first published in the United …