Foreword (The Unknown)
| First published | April 1963 |
|---|---|
| Type | Essay |
| Series | Asimov's Essays: Others' Work |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| April 1963 |
|
The Unknown | Pyramid Books | Anthology | 7 |
| October 1970 |
|
The Unknown | Pyramid Books | Anthology | 7 |
| October 1970 |
|
The Unknown | Pyramid Books | Anthology | 7 |
| 1973 |
|
Het onbekende | Luitingh | Anthology | 9 |
| August 1978 |
|
The Unknown | Jove / HBJ | Anthology | 7 |
| August 1978 |
|
The Unknown | Jove / HBJ | Anthology | 7 |