| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Social and environmental aspects of desertification: Proceedings of an Inter-Congress Meeting of the International Geographical Union Working Group on ... 3-8 January 1979, Tucson, Arizona, USA | 978-92-8O8-O127-9 (92-8O8-O127-9) | 1980 |