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Awadhwal, N K and Yule, D F (1991) New implements for small farmers of the semi-arid tropics. Animal genetic resources, 68 (1). pp. 73-77. ISSN 1014-6954
Cogle, A L and Rao, K P C and Yule, D F and George, P J and Srinivasan, S T and Smith, G D and Jangawad, L S (1997) Soil management options for Alfisols in the semi-arid tropics: annual and perennial crop production. Soil & Tillage Research, 44 (3-4). pp. 235-253. ISSN 0167-1987