A. K. · C.A. · C. K. · Charles K.
| title | ISBN-13 | year of publication |
|---|---|---|
| Death Traps to Treasure: Spanish and Mexican Mine Traps, Warning Signs and Symbols | 978-0-9632156-2-8 | 1994 |
| Spanish Monuments and Trailmarkers to Treasure in the United States | 978-0-9632156-1-1 | 1993 |
| Treasure Secrets of the Lost Dutchman | 978-0-9632156-3-5 | 1997 |
| Treasure Signs, Symbols, Shadow and Sun Signs | 978-0-9632156-0-4 | 1991 |
| Unfound Treasures of Mexico | 978-0-9632156-4-2 | 1995 |