| title | media type | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|---|
| A Field Guide to Western Butterflies | Paperback | 978-0-395-79151-6 (0-395-79151-0) | 1999 | Paul A. Opler |
| A Field Guide to Western Butterflies | Hardcover | 978-0-395-79152-3 (0-395-79152-9) | 1999 | " |