Author not established. Dr Eyob Ghebre-leul, (Geologist). Date not established. EHREA archive: /library/documents/doc-4f7def2d097bfdfff0724ab7/
[1] Dr Eyob Ghebre-leul, (Geologist). Original source: http://www.ehrea.org/iyobdusa.php. Preserved original: /library/originals/a4b291ad57b4ab9490e98a2c704128aa5e8cf876960f48c73b14ea48d5541d8c.html. SHA-256: a4b291ad57b4ab9490e98a2c704128aa5e8cf876960f48c73b14ea48d5541d8c