| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| A Birder's Guide to the Cincinnati Tristate | 978-0-9620685-0-8 | 1988 | |
| Birding Missouri: A Guide to Seasonal Highlights | 978-1-893111-02-8 | 2002 | |
| Colorado's Year, a Guide to Nature's Highlights | 978-0-9620685-9-1 | 1996 | |
| Guide to American Zoos and Aquariums | 978-0-9620685-4-6 | 1993 | Darcy Folzenlogen |
| The Nature of Missouri: A Year in the Heartland | 978-1-893111-03-5 | 2004 | |
| Walking the Denver-Boulder Region, Second Edition | 978-1-893111-00-4 | 1998 | Darcy |