Excerpt from the novel of the same name published soon afterward, as noted in its first appearance. Some sources (including Tuck) give the novel as an expansion of this novelette.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| December 1966 |
|
Analog Science Fiction -> Science Fact, December 1966 | Condé Nast | MAGAZINE | 52 |
| October 1973 |
|
Forward in Time | Walker & Co. | Collection | |
| January 1974 |
|
Forward in Time | Walker & Co. / SFBC | Collection | 95 |
| October 1974 |
|
Forward in Time | Popular Library | Collection | 139 |
| October 1974 |
|
Forward in Time | Popular Library | Collection | 139 |
| June 1982 |
|
Forward in Time | Popular Library | Collection | 137 |
| September 1986 |
|
Prometheans | Tor | Collection | 180 |
| April 2011 | Prometheans | Tor | Collection | ||
| January 2014 |
|
Forward in Time | ReAnimus Press | Collection | |
| October 2015 |
|
Visions of the Future | Lifeboat Foundation | Anthology | 113 |
| December 2015 |
|
Visions of the Future | Lifeboat Foundation | Anthology | |7 |
| December 2015 |
|
Mercury and Prometheans | Tor | Omnibus | |
| January 2016 |
|
Mercury and Prometheans | Tor | Omnibus | 566 |
| November 2016 |
|
Forward in Time | ReAnimus Press | Collection |