Introduction (X Stands for Unknown)
| First published | February 1984 |
|---|---|
| Type | Essay |
| Series | Asimov's Essays: Own Work |
Publications (2)
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| February 1984 |
|
X Stands for Unknown | Doubleday | Nonfiction | 9 |
| 1986 |
|
X Stands for Unknown | Grafton | Nonfiction | 9 |