| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1959 |
|
The Secret of the Ninth Planet | John C. Winston Co. | Novel | |
| April 1960 |
|
L'énigme de la neuvième planète | Les Editions Daniber | Novel | |
| April 1960 |
|
The Secret of the Ninth Planet | John C. Winston Co. | Novel | |
| November 1960 |
|
The Secret of the Ninth Planet | John C. Winston Co. | Novel | |
| September 1962 |
|
The Secret of the Ninth Planet | John C. Winston Co. | Novel | |
| January 1963 |
|
Galassia, #25 | Casa Editrice La Tribuna | MAGAZINE | 3 |
| July 1965 |
|
The Secret of the Ninth Planet | John C. Winston Co. | Novel | |
| November 1965 |
|
The Secret of the Ninth Planet | Paperback Library | Novel | 7 |
| January 1967 |
|
The Secret of the Ninth Planet | Holt, Rinehart and Winston | Novel | |
| May 1973 |
|
The Secret of the Ninth Planet | Warner Paperback Library | Novel | 5 |
| 1985 |
|
Robur 7 | Móra Ferenc Ifjúsági Könyvkiadó | Anthology | 3 |
| August 2009 |
|
The Secret of the Ninth Planet | CreateSpace | Novel | |
| September 2010 |
|
The Secret of the Ninth Planet | Project Gutenberg | Novel | |
| October 2010 |
|
The Secret of the Ninth Planet | Resurrected Press | Novel | |
| June 2012 |
|
The Secret of the Ninth Planet | LibriVox | Novel | |
| August 2012 |
|
The Tom Corbett Space Cadet Megapack: 10 Young Adult Sci-Fi Novels by Masters! | Wildside Press | Omnibus | 1502 |
| August 2013 |
|
The Secret of the Ninth Planet | LibriVox | Novel | |
| December 2013 |
|
The Secret of the Ninth Planet | Thunderchild Publishing | Novel | |
| September 2015 |
|
The Secret of the Ninth Planet | Thunderchild Publishing | Novel | |
| January 2016 |
|
Donald A. Wollheim: Sience Fiction Collection | Collection | ||
| June 2018 |
|
Beyond the Walls of Space / The Secret of the Ninth Planet | Armchair Fiction | Omnibus | |2 |