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Zaklada, prva je knjiga znanstvenofantastične Trilogije o Zakladi Isaaca Asimova. Trilogija je poslije proširena u serijal o Zakladi.
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'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 & …
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