The cover for "City Under the Sea" is not the one displayed: it is the cover for the other novel of this Ace Double (the cover art can be seen with the variant)
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1957 |
|
City Under the Sea / Star Ways | Ace Books | Omnibus | |
| June 1962 |
|
Die Feuerflut | Pabel | Novel |