| 其他書名 | A Research Design for Assessing Physical and Economic Losses in Soil Productivity |
| 出版 | SADCC Coordinator, Soil and Water Conservation and Land Utilization, Ministry of Agric. and Marketing, 1986 |
| URL | http://books.google.com.hk/books?id=eHg_AAAAYAAJ&hl=&source=gbs_api |