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Puzzles of the Black Widowers ou Enigmas dos Viúvos Negros é uma coletânea de contos escritos por Isaac Asimov envolvendo a sociedade fictícia Black Widowers.
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Quasar, Quasar, Burning Bright is a collection of seventeen scientific essays by Isaac Asimov. It was the thirteenth of a series of books collecting essays from The Magazine of Fantasy and Science Fiction. These essays were first published between May 1976 and September 1977. It was first published by Doubleday & …
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