| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| May 1962 |
|
The Ladder in the Sky / The Darkness Before Tomorrow | Ace Books | Omnibus | 5 |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| May 1962 |
|
The Ladder in the Sky / The Darkness Before Tomorrow | Ace Books | Omnibus | 5 |