X Stands for Unknown
| First published | August 1982 |
|---|---|
| Type | Essay |
| Series | Asimov's Essays: F&SF |
Publications (4)
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| August 1982 |
|
The Magazine of Fantasy & Science Fiction, August 1982 | Mercury Press, Inc. | MAGAZINE | 129 |
| February 1984 |
|
X Stands for Unknown | Doubleday | Nonfiction | 48 |
| March 1985 |
|
X Stands for Unknown | Discus / Avon | Nonfiction | 48 |
| 1986 |
|
X Stands for Unknown | Grafton | Nonfiction | 57 |