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Leihner, Dietrich Y Castillo Franco, Jesus Antonio Y Ruppenthal, Karl Y Hilgert, Thomas (1996) Soil Conservation effectiveness and Crop Productivity of forage legume intercropping, contour grass barriers and contour ridging in Cassava on Andean hillsides. Experimental Agriculture. ISSN 00144797
Ruppenthal, M. Y Leihner, Dietrich E Y Hilger, Thomas H Y Castillo, Jesús Antonio (1996) Rainfall erosivity and Erodibility of Inceptisol in the Southwest Colombian Andes. Experimental Agriculture, 32. pp. 327-338. ISSN 00144797