| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| MYSTERY OF ATLANTIS | 978-0-553-25073-2 | 1985 | |
| Scrutiny in the Great Round | 978-0-333-67179-5 | 1996 | Tennessee Dixon |
| Secret of the Knights | 978-0-553-23601-9 | 1984 | |
| Time Machine 4: Sail with the Pirates | 978-0-553-23808-2 | 1984 | |
J. G. · Jan Gaspard · Jan Gaspars · Jean Gosebrink · Joan Gasparin · Joana Gasper · John Gaisford · John Gaspard · John Guaspari · Juan Gaspari · Juan Gasparini