Letter (Astounding, January 1941): For Square Root Signs You Get a Special Typewriter—for the Calculus of Statement, Try Mace's "Principles of Logic." Ley Referred to the "Handbook of Chemistry and Physics."
| First published | January 1941 |
|---|---|
| Type | Essay |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| January 1941 |
|
Astounding Science-Fiction, January 1941 | Street & Smith Publications, Inc. | MAGAZINE | 157|157.1 |