| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Geography: Art / race / exile | 978-0-8195-6443-6 (0-8195-6443-5) | 2000 |
| Tree: belief / culture / balance | 978-0-8195-6699-7 (0-8195-6699-3) | 2004 |
R. L · Ralf Lehmann · Ralph Lehmann · Ralph Lemann · Rolf Lehmann · Rolf Lohmann · Rolf Lunheim