No Earthly Explanation
| Author | John Wallace Spencer |
| Genre | Paranormal |
| Original Language | English |
| First published | 1974-11 |
Editions 2
Add Edition| No Earthly Explanation (Mankind: A Space Experiment) | Paperback | English | Toronto New York London | 1974 | |
 | No Earthly Explanation (Mankind: A Space Experiment) | Mass-Market Paperback | English | Toronto New York London | 1974 |
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