Foreword (The Wheels of If, and Other Science Fiction)
| First published | 1949 |
|---|---|
| Type | Essay |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1949 |
|
The Wheels of If, and Other Science Fiction | Shasta | Collection | vii |
| October 1970 |
|
The Wheels of If and Other Science-Fiction | Berkley Medallion | Collection | 4 |