| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Cacti of Texas: A Field Guide, with Emphasis on the Trans-Pecos Species | 978-0-89672-611-6 (0-89672-611-8) | 2008 | A. Michael Powell · Shirley A. Powell |
| Cacti of the Trans-Pecos and Adjacent Areas | 978-0-89672-531-7 (0-89672-531-6) | 2004 | A. Michael Powell |