Tools for Brains
| First published | July 1939 |
|---|---|
| Type | Essay |
Publications (2)
| Date | Publication | Publisher | Type | Page |
|---|---|---|---|---|
| July 1939 | Astounding Science-Fiction, July 1939 | Street & Smith Publications, Inc. | MAGAZINE | 80 |
| February 1981 | Astounding Science Fiction, July 1939 | Southern Illinois University Press | Anthology | 80 |