Placement
- contained in Audiobook Collectionomnibus
- contained in Beyond the Beyondcollection
- contained in Friends, Robots, Countrymenanthology
- contained in Machines That Think: The Best Science Fiction Stories About Robots and Computersanthology
- contained in Men and Machinesanthology
- contained in Phases of the Mooncollection
- contained in Sunrise on Mercury and Other Science Fiction Storiescollection
- contained in The Best of Robert Silverberg: Stories of Six Decadescollection
- contained in The Road to Nightfallcollection
- contained in To Be Continuedcollection