Letter (Astounding Stories, April 1937): Submarine Intelligence Possibilities.
| First published | April 1937 |
|---|---|
| Type | Essay |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| April 1937 |
|
Astounding Stories, April 1937 | Street & Smith Publications, Inc. | MAGAZINE | 154|154.4 |