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4 treff

Precious earth : from soil and water conservation to sustainable land management
Hurni, Hans
Bok Engelsk 1996
Erosion, conservation, and small-scale farming
edited by Hans Hurni and Kebede Tato
Bok Engelsk 1992
Soil conservation for survival
edited by Kebede Tato and Hans Hurni
Bok Engelsk 1992
African mountains and highlands : problems and perspectives
Bruno Messerli and Hans Hurni, editors
Bok Engelsk 1990