An estimation of the word count puts their number at around 33,000: thus, this is a novella by ISFDB standard.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1956 |
|
Planet of No Return / Star Guard | Ace Books | Omnibus | 5 |
| April 1966 |
|
Planet of No Return | Dennis Dobson | Chapbook | |
| January 1971 |
|
Planet of No Return | Tandem | Chapbook | 7 |
| 1974 |
|
Planet of No Return | Dennis Dobson | Chapbook | |
| January 1974 |
|
The Worlds of Poul Anderson | Ace Books | Omnibus | |
| 1978 |
|
Planet of No Return | Universal | Chapbook | 7 |