Agent of the Unknown is a verbatim reprint of Vulcan's Dolls from Startling Stories.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| March 1956 |
|
The World Jones Made / Agent of the Unknown | Ace Books | Omnibus | 5 |
| April 2009 |
|
Agent of the Unknown | Wildside Press | Novel | |
| March 2017 |
|
Agent of the Unknown | Gateway / Orion | Novel |