| Author | Olaf Stapledon |
| Publisher | Minotauro |
| Publisher Series | Ciencia - Ficción |
| Translated by | Floreal Mazía |
| Format | Soft cover |
| Language | Spanish |
| Location | Buenos Aires, Argentina |
| This Edition Published | 1960 |
| Pages / Font | 226 pages |
| Volume Number | 15 |
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