- Author
- Thornton PageCarl Sagan
- Publisher
- W.W. Norton & Co. Inc
- Language
- English
- Year
- 1974
- Page
- 341
- ISBN
- 0393007391,9780393007398
- File Type
- File Size
- 13.2 MiB
Scientists examine photographs, sighting reports, and radar tracings to analyze the possibility of alien visitors to Earth.
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