Scientific Mysteries: (Unknown Life Forms)
| First published | August 1941 |
|---|---|
| Type | Essay |
| Series | Scientific Mysteries |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| August 1941 |
|
Amazing Stories, August 1941 | Ziff-Davis Publishing Company | MAGAZINE | 124 |
| March 2015 |
|
Science Fiction Classics #7 | Pulp Tales Press | Anthology | 124 |