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The Obvious Factor

Isaac Asimov

First published May 1973
Type Short Fiction
Length Short Story
Series Black Widowers

Date Publication Publisher Type Page
May 1973 Cover Ellery Queen's Mystery Magazine, May 1973 Davis Publications MAGAZINE 6
June 1974 Cover Tales of the Black Widowers Doubleday Collection 79
1976 Cover Tales of the Black Widowers Panther Collection 96
1976 Cover De zwarte weduwnaars Bruna Collection 91
1976 Cover Die bösen Geschichten der schwarzen Witwer Heyne Collection 59
August 1976 Cover Tales of the Black Widowers Fawcett Crest Collection 96
August 1976 Cover Tales of the Black Widowers Fawcett Crest Collection 96
August 1986 Cover The Best Mysteries of Isaac Asimov Doubleday & Company Collection 3
1987 Cover The Best Mysteries of Isaac Asimov Grafton Books Collection 3
September 1987 Cover The Best Mysteries of Isaac Asimov Fawcett Gold Medal / Ballantine Collection 3
December 2003 Cover The Return of the Black Widowers Carroll & Graf Collection 53
November 2005 Cover The Return of the Black Widowers Carroll & Graf Collection 53
May 2007 Cover Le club des veufs noirs Flammarion Collection 67