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<http://dbpedia.org/resource/X_Stands_for_Unknown>	<http://www.w3.org/2000/01/rdf-schema#comment>	"'X' Stands for Unknown is a collection of seventeen nonfiction science essays written by Isaac Asimov. It was the seventeenth of a series of books collecting essays from The Magazine of Fantasy and Science Fiction, these being first published between January 1982 and May 1983. It was first published by Doubleday & Company in 1984."@en .
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