C. O'Brien · Christopher B. · Christopher Obrien · O'Brien
Adventures Unlimited Press · St. Martin's Press
| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Enter the Valley: UFOs, Religious Miracles, Cattle Mutilations, and Other Unexplained Phenomena in the San Luis Valley | 978-0-312-96835-9 (0-312-96835-3) | 1999 |
| Mysterious Valley | 978-0-312-95883-1 (0-312-95883-8) | 1996 |
| Secrets of the Mysterious Valley | 978-1-931882-66-8 (1-931882-66-5) | 2007 |