J. Perry · P.J. · Phyllis Jean Perry · Phyllis Perry
Fulcrum Publishing · McGraw-Hill
| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| A Kid's Look at Colorado | 978-1-55591-856-9 (1-55591-856-5) | 2005 |
| A Teacher's Science Companion | 978-0-07-049518-0 (0-07-049518-1) | 1994 |
| It Happened in Rocky Mountain National Park | 978-0-7627-4238-7 (0-7627-4238-0) | 2008 |