An estimation of the word count puts their number at below 33,000: thus, this is a novella by ISFDB standard.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| January 1974 |
|
The Worlds of Poul Anderson | Ace Books | Omnibus | |
| July 2013 |
|
War of Two Worlds | Gateway / Orion | Chapbook |