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2
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Is soil fertility declining? : perspectives on environmental change in Southern Ethiopia / Eyasu Elias.
- IIED. Drylands programme,
- 1998.
- Edinburgh :
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Managing fragile soils : a case study from North Wollo, Ethiopia / Eyasu Elias and Daniel Fantaye.
- IIED. Drylands programme,
- 2000.
- Edinburgh :