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Understanding the Environmental Changes in Tigray: a Photographic Record over 30 Years [Monograph]
Nyssen, J. \ Munro, N. \ Haile, M. \ Poesen, J. \ Descheemaeker, K. \ Haregewyn, N. \ Moeyersons, J. \ Govers, G. \ Deckers, J. \ 2007
soil degradation - environment - erosion - vegetation - Ethiopia
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