The Project Gutenberg edition is based on the Ace edition. At 33,000 words in length this item is a novella.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1966 |
|
The Planeteers / The Ultimate Weapon | Ace Books | Omnibus | 5|2 |
| May 1976 |
|
The Ultimate Weapon | Ace Books | Chapbook | 1 |
| December 2007 | The Ultimate Weapon | Project Gutenberg | Chapbook | ||
| May 2008 |
|
The Ultimate Weapon | Phoenix Pick | Chapbook | |
| September 2011 |
|
The Ultimate Weapon | Gateway / Orion | Chapbook | |
| October 2011 |
|
The Ultimate Weapon | LibriVox | Chapbook | |
| September 2012 |
|
The Cosmic Junkman / The Ultimate Weapon | Armchair Fiction | Anthology | |
| July 2013 |
|
The Ultimate Weapon | CreateSpace | Chapbook | |
| September 2013 |
|
The Ultimate Weapon | CreateSpace | Chapbook | |
| January 2024 |
|
The Ultimate Weapon | Faded Page | Chapbook |