L. S. ยท L. Sorensen
| title | ISBN-13 | year of publication |
|---|---|---|
| Comets and Meteors | 978-0-86593-277-7 | 1993 |
| Memorial Day | 978-1-57103-071-9 | 1994 |
| Moon | 978-0-86593-273-9 | 1993 |
| Planets | 978-0-86593-274-6 | 1993 |
| Stars | 978-0-86593-276-0 | 1993 |
| Sun | 978-0-86593-272-2 | 1993 |
| The Earth | 978-0-86593-275-3 | 1993 |