A prequel to "World's Fair, 1992", although the latter is often inaccurately billed as a rewrite of "Regan's Planet".
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| March 1964 |
|
Regan's Planet | Pyramid Books | Novel | 7 |
| January 1965 |
|
I Romanzi del Cosmo #163 | Ponzoni | MAGAZINE | 3 |
| March 1976 |
|
Regans Satellit | Pabel | Novel | 7 |
| September 2011 |
|
Regan's Planet | Gateway / Orion | Novel | |
| January 2016 |
|
Someone to Watch Over Me / Regan's Planet | Armchair Fiction | Omnibus | 10 |