Letters (Astounding Stories, July 1937): Science-Fiction of Math.
| First published | July 1937 |
|---|---|
| Type | Essay |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| July 1937 |
|
Astounding Stories, July 1937 | Street & Smith Publications, Inc. | MAGAZINE | 156|156.1 |