¿Existió otra Humanidad?
| Format | Soft cover |
| Language | Spanish |
| This Edition Published | 1975 |
| Original Language | English |
| Author | Walt C. Dovan |
| Publisher | Producciones Editoriales |
| Format | Soft cover |
| Language | Spanish |
| Location | Spain |
| This Edition Published | 1975 |
| Pages / Font | 290 pages |
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