| Original Language | English |
| First published | 1941-05 |
| Links | http://www.isfdb.org/cgi-bin/title.cgi?99788 |
| Notes | Mission Unknown! is a novella by Henry Hasse, first published in Super Science Novels, May 1941. |
Editions 1
Add Edition| Title | Publisher | Format | Language | Location | Dates | Impression | |
|---|---|---|---|---|---|---|---|
 | Super Science Novels Magazine, May 1941 | Fictioneers, Inc. | Pulp Magazine | English | Chicago, IL | 1941 |