| title | ISBN-13 | year of publication |
|---|---|---|
| 2012 ECOlogical Engagement Calendar | 978-0-7649-5797-0 | 2011 |
| Chris Hardman's Ecological 2013 Calendar: A New Way to Experience Time | 978-0-7649-6046-8 | 2012 |
| Chris Hardman's ECOlogical Seasons | 978-0-7649-5414-6 | 2010 |
| Ecological 2010 Calendar | 978-0-7649-4843-5 | 2009 |
| Ecological 2010 Calendar: A New Way to Experience Time | 978-0-7649-4845-9 | 2009 |
| Ecological 2011 Calendar | 978-0-7649-5303-3 | 2010 |
| ECOlogical 2011 Weekly Engagement Calendar | 978-0-7649-5304-0 | 2010 |
| Ecological 2012 Calendar | 978-0-7649-5796-3 | 2011 |
C.H. · Cherrsy Heartmann · Chris Harden · Chris Harding · Chris Hartmann · Chris Hartney · Chris Horton · Craig Harding