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1Soil erosion and land degradation the global risks Soil erosion and land degradation the global risksby Lal, RattanTexto bibliotecaUBA FA
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13The global impact of soil erosion on productivity II, effects on crop yields and production over time The global impact of soil erosion on productivity II, effects on crop yields and production over timeby Den Biggelaar, Christoffel, Lal, Rattan, Wiebe, Keith, Eswaran, Hari, Breneman, Vince, Reich, PaulTexto bibliotecaUBA FA