According to The Unknown Unknown by Will Murray, Hubbard revised "Prisoners of the Brain", an unpublished story by Robert P. Toombs.
| Year | Award | Category | Status |
|---|---|---|---|
| 2016 | Retro Hugo Award | Best Novel | Nominee/Finalist |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| November 1940 |
|
Unknown Fantasy Fiction, November 1940 | Street & Smith Publications, Inc. | MAGAZINE | 9 |
| December 1940 |
|
Unknown, December 1940 | Street & Smith Publications, Inc. | MAGAZINE | 127 |
| 1951 |
|
Typewriter in the Sky / Fear | Gnome Press | Omnibus | 9 |
| 1953 |
|
Typewriter in the Sky | Cherry Tree / Fantasy Books | Novel | |
| November 1955 |
|
I Romanzi di Urania #105 | Mondadori | MAGAZINE | 3 |
| July 1977 |
|
Fear & Typewriter in the Sky | Popular Library | Omnibus | 7 |
| July 1977 |
|
Fear & Typewriter in the Sky | Popular Library | Omnibus | 9 |
| May 1980 |
|
La trama tra le nubi | Libra Editrice | Collection | 19 |
| 1994 | Typewriter in the Sky | Author Services, Inc. | Novel | ||
| August 1995 |
|
Typewriter in the Sky | Bridge Publications / SFBC | Novel | |
| September 1995 |
|
Typewriter in the Sky | Bridge Publications | Novel | 1 |
| January 1997 |
|
La trama proibita | Editrice Nord | Novel | 1 |
| January 2012 |
|
Typewriter in the Sky | Galaxy Press | Novel | |
| February 2013 |
|
Typewriter in the Sky | ReadHowYouWant | Novel | |
| April 2013 |
|
Typewriter in the Sky | Galaxy Press | Novel |