Parallel Pasts
From Author Wars - https://authorwars.com/books/parallel-pasts-908595.html
Overview:
- Title: Parallel Pasts
- Author: Martin Gardner
- Year: 1981
- Type: Short Fiction
- Series: SF Puzzles
Editions/Publications:
- Unknown. Puzzles from Other Worlds: Fantastical Brainteasers from Isaac Asimov's Science Fiction Magazine (Unknown, Martin Gardner, Oxford University Press, ISBN-10: 0192860666, £3.95, xii+189 pages, Trade Paperback, Collection)
- 1981 . Isaac Asimov's Science Fiction Magazine, October 26, 1981 (1981, Martin Gardner, Davis Publications, $1.50, 180 pages, digest, MAGAZINE)