ANALYTICAL STUDY OF THE COSTS OF PRODUCTIVITY AND THE NET RETURN OF SOME FIELD CROPS IN DAKAHLIA GOVERNORATE دراسة تحلیلیة للتکالیف الإنتاجیة والعائد الصافی لمحصولى الکفاءة لااقتصادیة القمح والأرز بمحافظة الدقهلیة
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