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Farming systems principles for improved food production and the control of soil degradation in the arid, semi-arid, and humid tropics : summary of proceedings of an experts' meeting sponsored by the United Nations Environment Programme, 20-30 June 1983, ICRISAT Center, India.
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Patancheru :
International Crops Research Institute for the Semi-Arid Tropics for UNEP,
1986.
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