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by International Soil Tillage Research Organization. Conference (12th : 1991 : Ibadan, Nigeria); International Soil Tillage Research Organization.;
Year: [1991], Callno: 05:631.51
Conference proceedings
by International Soil Tillage Research Organization. Conference (8th : 1979 : University of Hohenheim);
Year: 1979]., Callno: 05:631.51
Conference proceedings
by International Soil Tillage Research Organization. International conference (11th : 1988 : Edinburgh, Scotland);
Year: 1988 ., Callno: 05:631.51
Conference proceedings
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