| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Mammoth Cave Saltpeter Works | 978-0-9713038-2-9 (0-9713038-2-7) | 2005 |
| Outer door to the auger hole--and beyond: The exploration of Wyandotte Cave | 978-0-9713038-1-2 (0-9713038-1-9) | 2001 |
| The saltpeter empires of Great Saltpetre Cave and Mammoth Cave | 978-0-9713038-0-5 (0-9713038-0-0) | 2001 |