Publications (5)
| Date | Publication | Publisher | Type | Page |
|---|---|---|---|---|
| September 1964 | Amazing Stories, September 1964 | Ziff-Davis Publishing Company | MAGAZINE | 76 |
| October 1968 | Great Science Fiction, Fall 1968 | Ultimate Publishing Co., Inc. | MAGAZINE | 108 |
| September 2002 | Eternal Frontier | Baen Books | Collection | 322 |
| September 2002 | Eternal Frontier | Baen Books | Collection | |
| March 2004 | Eternal Frontier | Baen Books | Collection | 436 |