DO NOT MERGE with other 1971 cover for the same title.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1971 |
|
The World of Null-A | Sphere | Novel | |
| 1972 |
|
Stadt der Wissenden | Andromeda (Germany) | Chapbook | |
| 1980 |
|
Irgendwo im All | Pelikan | Anthology |