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Nyssen, Jan; Crummey, Donald; Munro, Neil; Haile, Mitiku; Poesen, Jean; Frank, Amaury; Hurni, Hans; Descheemaeker, K; Ritler, Alfons; Nievergelt, Bernhard; Moeyersons, Jan; Deckers, Jozef; Billi, Paolo (2009). Land Degradation and Resilience in the North Ethiopian Highlands as evidenced by Historical Photographs. In: 17th International Conference of Ethiopian Studies. Addis Abeba, Ethiopia.
