L. S. · Leonhard Schenk · Leonhard Sohncke
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Challenges, an activity book to accompany General science for tommorrow's world | 978-0-07-059350-3 (0-07-059350-7) | 1980 |
| N.Y.C. High School Pics, 1968-1970 | 978-1-4134-8237-9 (1-4134-8237-6) | 2008 |