| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Wild Orchids Across North America: A Botanical Travelogue | 978-0-88192-720-7 (0-88192-720-1) | 2005 |
| Wild Orchids Across North America: A Botanical Travelogue: A Botanical Travelogue | 978-0-88192-452-7 (0-88192-452-0) | 1998 |