Prentice Hall · Simon & Schuster
| title | media type | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|---|
| Clear Intent: The Government Coverup of the Ufo Experience | Paperback | 978-0-13-136649-7 | 1984 | Barry J. Greenwood |
| Clear Intent: The Government Coverup of the Ufo Experience | Hardcover | 978-0-13-136656-5 | 1984 | " |
| The UFO Cover -up - What the Government Won't Say | Paperback | 978-0-13-137712-7 | 1993 | " |
| UFO Cover-up: What the Government Won't Say | " | 978-0-671-76555-2 | 1990 | |