Nature and causes of land degradation in the Oromiya region : a review / Bezuayehu Tefera ..[et al.] - 1st ed. - Nairobi : ILRI, 2002. - vi, 77 p. ISBN: 9291461039 : Subjects--Topical Terms: Soil degradation--Oromiyakelel, Ethiopia.Soil erosion--Oromiyakelel, Ethiopia.