Timber Press · Timber Press, Incorporated
| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| Columbines: Aquilegia, Paraquilegia, and Semiaquilegia | Paperback | 978-1-60469-225-9 | 2010 |
| Columbines: Aquilegia, Paraquilegia, and Semiaquilegia | Hardcover | 978-0-88192-588-3 | 2003 |
| High and Dry: Gardening with Cold-Hardy Dryland Plants | " | 978-0-88192-872-3 | 2008 |
| Penstemons | Paperback | 978-1-60469-224-2 | 2010 |
| Penstemons | Hardcover | 978-0-88192-429-9 | 1999 |