| 7.8/ 10 1Votes 7.8 
 Country United States Pages 218 Originally published 1984 Page count 218 |  3.9/5  Goodreads Language English ISBN 0-385-18915-X Genres Science, Essay | |||||||||||||||||||||||||||||||||
| Series Fantasy & Science Fiction essays Similar Isaac Asimov books, F&SF Essay Collections books, Science books | ||||||||||||||||||||||||||||||||||
'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.
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X Stands for Unknown Wikipedia(Text) CC BY-SA
