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Virmani, S M and Sivakumar, M V K and Reddy, S. J., S J (1980) Climatic classification of the semi-arid tropics in relation to farming systems research. In: International Crops Research Institute for the Semi-Arid Tropics: Climatic classification: a consultants' meeting, 14-16 April 1980. , ICRISAT Patancheru, Andhra Pradesh, India.