| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1953 |
|
The Green Millennium | Abelard Press | Novel | |
| October 1954 |
|
The Green Millennium | Lion Library | Novel | 7 |
| 1960 | The Green Millennium | Abelard-Schuman | Novel | ||
| 1964 |
|
The Green Millennium | Icon Books Limited | Novel | 7 |
| June 1964 |
|
I Romanzi del Cosmo #149 | Ponzoni | MAGAZINE | 3 |
| March 1969 |
|
The Green Millennium / Night Monsters | Ace Books | Omnibus | 5|0.5 |
| May 1976 |
|
The Green Millennium | Ace Books | Novel | 1 |
| November 1976 |
|
The Green Millennium | Orbit / Futura | Novel | 1 |
| 1977 |
|
De Groene Kat | Scala | Novel | |
| March 1977 |
|
The Green Millennium | Severn House | Novel | 1 |
| June 1978 |
|
Urania #751 | Mondadori | MAGAZINE | 3 |
| September 1978 |
|
Das grüne Milllennium | Heyne | Novel | |
| November 1980 |
|
Le millénaire vert | OPTA | Novel | |
| December 1980 |
|
The Green Millennium | Gregg Press | Novel | 6 |
| June 1983 |
|
The Green Millennium | Ace Science Fiction Books | Novel | 1 |
| February 1992 |
|
The Green Millennium | Collier / Macmillan | Novel | 1 |
| July 1993 |
|
Il verde millennio | Mondadori | Novel | 13 |
| June 1994 |
|
Il verde millennio | Mondadori | Novel | 13 |
| April 2001 |
|
The Green Millennium | Olmstead Press/e-reads | Novel | |
| December 2007 |
|
The Green Millennium | Wildside Press | Novel | |
| December 2007 |
|
The Green Millennium | Wildside Press | Novel | |
| May 2008 |
|
The Green Millennium | Wonder Audiobooks | Novel | |
| April 2014 |
|
The Green Millennium | Open Road Integrated Media | Novel | |
| September 2016 |
|
The Green Millennium | Gateway / Orion | Novel | |
| June 2021 | The Green Millennium | Project Gutenberg | Novel |