Placement
- contained in Across Real Time Series & Moreomnibus
- contained in Best Science Fiction Stories of the Year, Second Annual Collectionanthology
- contained in Explorers: SF Adventures to Far Horizonsanthology
- contained in Exploring the Horizons: Explorers, and the Furthest Horizonomnibus
- contained in Great Science Fiction: Stories by the World's Great Scientistsanthology
- contained in Machines That Think: The Best Science Fiction Stories About Robots and Computersanthology
- contained in The 1973 Annual World's Best SFanthology
- contained in The Collected Stories of Vernor Vingecollection
- contained in True Names ... and Other Dangerscollection