| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1965 |
|
The Caves of Mars / Space Mercenaries | Ace Books | Omnibus | 5|2 |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1965 |
|
The Caves of Mars / Space Mercenaries | Ace Books | Omnibus | 5|2 |