- E-bookA Walk in the Desert, 2nd EditionRebecca L. Johnson
- E-bookA Walk in the Deciduous Forest, 2nd EditionRebecca L. Johnson
- E-bookA Walk in the Boreal Forest, 2nd EditionRebecca L. Johnson
- E-bookA Walk in the Prairie, 2nd EditionRebecca L. Johnson
- E-bookA Walk in the Tundra, 2nd EditionRebecca L. Johnson
- E-bookA Walk in the Rain Forest, 2nd EditionRebecca L. Johnson