Letter (Astounding, April 1939): Readers of Astounding Science-Fiction:
| First published | April 1939 |
|---|---|
| Type | Essay |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| April 1939 |
|
Astounding Science-Fiction, April 1939 | Street & Smith Publications, Inc. | MAGAZINE | 162|162.1 |