Under Observation (Captain Future, Spring 1940)
| First published | April 1940 |
|---|---|
| Type | Essay |
| Series | Under Observation |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| April 1940 |
|
Captain Future, Spring 1940 | Better Publications, Inc. | MAGAZINE | 6|6.1 |
| August 2016 |
|
Captain Future, Spring 1940 | Adventure House | Anthology | 6|6.1 |