| Titel | ISBN-13 (ISBN-10) | Erscheinungsjahr |
|---|---|---|
| Environmental changes in Botswana's Okavango Delta region: 1849-2001: The role of human factors in the degradation of natural resources in Botswana's Okavango Delta sub-region | 978-3-8383-O16O-O (3-8383-O16O-9) | 2009 |