استعرض حسب المؤلف "abdel-razek, A. H."
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optimum sample size for estimating dura crop yield rate in sudan
abdel-razek, A. H.; hassan, abdel-azim (the institute of national planning, 1976)the sudan is predominantly an agricultural country, agriculture is the main sector of its economy and its principal source of foreign exchange the government is building up most of its social and economical development ...